From e70518f7686d0194dae8f2b7262108ea2189bf9f Mon Sep 17 00:00:00 2001
From: Matt Kingshott <51963402+mattkingshott@users.noreply.github.com>
Date: Thu, 2 Apr 2020 13:06:35 +0100
Subject: [PATCH] added error message support, added comma-separated string
 array support to in and isNotIn rules.

---
 README.md                  | 32 +++++++++++++-
 dist/iodine.min.js         |  2 +-
 dist/iodine.min.js.map     |  2 +-
 dist/iodine.min.mjs        |  2 +-
 dist/iodine.min.mjs.map    |  2 +-
 dist/iodine.min.umd.js     |  2 +-
 dist/iodine.min.umd.js.map |  2 +-
 resources/size.svg         |  4 +-
 resources/version.svg      |  4 +-
 src/iodine.js              | 91 +++++++++++++++++++++++++++++++++++++-
 tests/test.js              | 36 ++++++++++++++-
 11 files changed, 163 insertions(+), 16 deletions(-)

diff --git a/README.md b/README.md
index a91a70f..a7a53d3 100755
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Iodine.js is a micro client-side validation library. It has no dependencies and
 The easiest way to pull Iodine into your project is via a CDN:
 
 ```html
-<script src="https://cdn.jsdelivr.net/gh/mattkingshott/iodine@1/dist/iodine.min.js" defer></script>
+<script src="https://cdn.jsdelivr.net/gh/mattkingshott/iodine@2/dist/iodine.min.js" defer></script>
 ```
 
 ## Usage
@@ -54,7 +54,9 @@ Iodine.is(item_2, ['required', 'integer']); // false
 
 The `is` method will return `true` if the item passes every rule.
 
-Alternatively, the name of the first rule that failed will be returned e.g. `'integer'`. You are then free to interpret the rule name and display a (localised) error message.
+Alternatively, the name of the first rule that failed will be returned e.g. `'integer'`.
+
+> Version 1 of Iodine only returned the rule name e.g. 'minimum'. Version 2+ returns the rule name and any supplied parameter e.g. 'minimum:7'.
 
 ## Additional parameters
 
@@ -84,6 +86,32 @@ Iodine.is(item_3, ['optional', 'integer']); // false
 
 **IMPORTANT**: If you wish to allow for optional values, then you must supply `'optional'` as the first rule in the list.
 
+## Error messages
+
+Iodine includes a default set of error messages for the English language. To retrieve an error message for a rule, use the `getErrorMessage` method:
+
+```js
+Iodine.getErrorMessage('array'); // string
+```
+
+When dealing with parameters, the `getErrorMessage` method allows you to supply the rule either as a single `string` or as two arguments (the rule and parameter) e.g.
+
+```js
+Iodine.getErrorMessage('minimum:7'); // string
+Iodine.getErrorMessage('minimum', 7); // string
+```
+
+## Custom messages (localisation)
+
+You can easily replace the default error messages with your own via the `setErrorMessages` method. This method requires a single parameter, which is an `object` containing the messages. See the [_defaultMessages](src/iodine.js) method for an example of this object.
+
+Iodine will automatically swap `[PARAM]` placeholders with the parameters supplied in the `getErrorMessage` method. As such, you should insert this placeholder at the appropriate position in your new error message e.g.
+
+```js
+Iodine.setErrorMessages({ same: `Field must be '[PARAM]'` });   // English
+Iodine.setErrorMessages({ same: `Champ doit être '[PARAM]'` }); // French
+```
+
 ## Available rules
 
 The following validation rules are available:
diff --git a/dist/iodine.min.js b/dist/iodine.min.js
index 6e129b8..023adcc 100644
--- a/dist/iodine.min.js
+++ b/dist/iodine.min.js
@@ -1,2 +1,2 @@
-var t=function(){};t.prototype._dateCompare=function(t,e,r,n){return void 0===n&&(n=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&n?t.getTime()<=e:"less"!==r||n?"more"===r&&n?t.getTime()>=e:"more"!==r||n?void 0:t.getTime()>e:t.getTime()<e)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return e.includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!e.includes(t)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r].split(":")[0];return!0},window.Iodine=new t,module.exports=t;
+var t=function(){this.messages=this._defaultMessages()};t.prototype._dateCompare=function(t,e,r,i){return void 0===i&&(i=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&i?t.getTime()<=e:"less"!==r||i?"more"===r&&i?t.getTime()>=e:"more"!==r||i?void 0:t.getTime()>e:t.getTime()<e)},t.prototype._defaultMessages=function(){return{after:"The date must be after: '[PARAM]'",afterOrEqual:"The date must be after or equal to: '[PARAM]'",array:"Field must be an array",before:"The date must be before: '[PARAM]'",beforeOrEqual:"The date must be before or equal to: '[PARAM]'",boolean:"Field must be true or false",date:"Field must be a date",different:"Field must be different to '[PARAM]'",endingWith:"Field must end with '[PARAM]'",email:"Field must be a valid email address",falsy:"Field must be a falsy value (false, 'false', 0 or '0')",in:"Field must be one of the following options: [PARAM]",integer:"Field must be an integer",json:"Field must be a parsable JSON object string",maximum:"Field must not be greater than '[PARAM]' in size or character length",minimum:"Field must not be less than '[PARAM]' in size or character length",notIn:"Field must not be one of the following options: [PARAM]",numeric:"Field must be numeric",optional:"Field is optional",regexMatch:"Field must satisify the regular expression: [PARAM]",required:"Field must be present",same:"Field must be '[PARAM]'",startingWith:"Field must start with '[PARAM]'",string:"Field must be a string",truthy:"Field must be a truthy value (true, 'true', 1 or '1')",url:"Field must be a valid url",uuid:"Field must be a valid UUID"}},t.prototype.getErrorMessage=function(t,e){void 0===e&&(e=null);var r=t.split(":")[0],i=e||t.split(":")[1];return["after","afterOrEqual","before","beforeOrEqual"].includes(r)&&(i=new Date(parseInt(i)).toLocaleTimeString(void 0,{year:"numeric",month:"short",day:"numeric",hour:"2-digit",minute:"numeric"})),void 0===i?this.messages[r]:this.messages[r].replace("[PARAM]",i)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return(e="string"==typeof e?e.split(","):e).includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!this.isIn(t,e)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r];return!0},t.prototype.setErrorMessages=function(t){this.messages=t},window.Iodine=new t,module.exports=t;
 //# sourceMappingURL=iodine.min.js.map
diff --git a/dist/iodine.min.js.map b/dist/iodine.min.js.map
index 6766ef4..162c6ac 100644
--- a/dist/iodine.min.js.map
+++ b/dist/iodine.min.js.map
@@ -1 +1 @@
-{"version":3,"file":"iodine.min.js","sources":["../src/iodine.js"],"sourcesContent":["/*\n|--------------------------------------------------------------------------\n| Iodine - JavaScript Library\n|--------------------------------------------------------------------------\n|\n| This library contains a collection of useful validation rules that can\n| be used to quickly verify whether items meet certain conditions.\n|\n*/\nexport default class Iodine\n{\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_dateCompare(first, second, type, equals = false)\n\t{\n\t\tif (! this.isDate(first)) return false;\n\n\t\tif (! this.isDate(second) && ! this.isInteger(second)) return false;\n\n\t\tsecond = typeof second === 'number' ? second : second.getTime();\n\n\t\tif (type === 'less' && equals) return first.getTime() <= second;\n\t\tif (type === 'less' && ! equals) return first.getTime() < second;\n\t\tif (type === 'more' && equals) return first.getTime() >= second;\n\t\tif (type === 'more' && ! equals) return first.getTime() > second;\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after another given date.\n\t *\n\t **/\n\tisAfter(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after or equal to another given date.\n\t *\n\t **/\n\tisAfterOrEqual(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an array.\n\t *\n\t **/\n\tisArray(value)\n\t{\n\t\treturn Array.isArray(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before another given date.\n\t *\n\t **/\n\tisBefore(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before or equal to another given date.\n\t *\n\t **/\n\tisBeforeOrEqual(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a boolean.\n\t *\n\t **/\n\tisBoolean(value)\n\t{\n\t\treturn [true, false].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a date object.\n\t *\n\t **/\n\tisDate(value)\n\t{\n\t\treturn value && Object.prototype.toString.call(value) === '[object Date]' && ! isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is numeric (an integer or a float).\n\t *\n\t **/\n\tisNumeric(value)\n\t{\n\t\treturn ! isNaN(parseFloat(value)) && isFinite(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is optional.\n\t *\n\t **/\n\tisOptional(value)\n\t{\n\t\treturn [null, undefined, ''].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value satisifies the given regular expression.\n\t *\n\t **/\n\tisRegexMatch(value, expression)\n\t{\n\t\treturn new RegExp(expression).test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is present.\n\t *\n\t **/\n\tisRequired(value)\n\t{\n\t\treturn ! this.isOptional(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is the same as another given value.\n\t *\n\t **/\n\tisSame(value, different)\n\t{\n\t\treturn value === different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value starts with another given value.\n\t *\n\t **/\n\tisStartingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.startsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a string.\n\t *\n\t **/\n\tisString(value)\n\t{\n\t\treturn typeof value === 'string';\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is truthy.\n\t *\n\t **/\n\tisTruthy(value)\n\t{\n\t\treturn [1, '1', true, 'true'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid URL.\n\t *\n\t **/\n\tisUrl(value)\n\t{\n\t\treturn new RegExp('^(https?:\\\\/\\\\/)?((([a-z\\\\d]([a-z\\\\d-]*[a-z\\\\d])*)\\\\.)+[a-z]{2,}|((\\\\d{1,3}\\\\.){3}\\\\d{1,3}))(\\\\:\\\\d+)?(\\\\/[-a-z\\\\d%_.~+]*)*(\\\\?[;&a-z\\\\d%_.~+=-]*)?(\\\\#[-a-z\\\\d_]*)?$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid UUID.\n\t *\n\t **/\n\tisUuid(value)\n\t{\n\t\treturn new RegExp('^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine whether the given value meets the given rules.\n\t *\n\t **/\n\tis(value, rules = [])\n\t{\n\t\t// Check if no rules were specified\n\t\tif (rules.length === 0) return true;\n\n\t\t// Check for an optional value\n\t\tif (rules[0] === 'optional' && this.isOptional(value)) return true;\n\n\t\t// Iterate through the rules\n\t\tfor (let index = 0; index < rules.length; index++) {\n\n\t\t\t// Ignore optional rules\n\t\t\tif (rules[index] === 'optional') continue;\n\n\t\t\t// Determine the method to use\n\t\t\tlet rule = rules[index].split(':')[0][0].toUpperCase()\n\t\t\t\t\t + rules[index].split(':')[0].slice(1);\n\n\t\t\t// Validate the value against the method\n\t\t\tlet result = this[`is${rule}`].apply(this, [value, rules[index].split(':')[1]]);\n\n\t\t\t// Check if the value failed validation\n\t\t\tif (! 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equals) return first.getTime() > second;\n\t}\n\n\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_defaultMessages()\n\t{\n\t\treturn {\n\t\t\tafter         : `The date must be after: '[PARAM]'`,\n\t\t\tafterOrEqual  : `The date must be after or equal to: '[PARAM]'`,\n\t\t\tarray         : `Field must be an array`,\n\t\t\tbefore        : `The date must be before: '[PARAM]'`,\n\t\t\tbeforeOrEqual : `The date must be before or equal to: '[PARAM]'`,\n\t\t\tboolean       : `Field must be true or false`,\n\t\t\tdate          : `Field must be a date`,\n\t\t\tdifferent     : `Field must be different to '[PARAM]'`,\n\t\t\tendingWith    : `Field must end with '[PARAM]'`,\n\t\t\temail         : `Field must be a valid email address`,\n\t\t\tfalsy         : `Field must be a falsy value (false, 'false', 0 or '0')`,\n\t\t\tin     \t\t  : `Field must be one of the following options: [PARAM]`,\n\t\t\tinteger       : `Field must be an integer`,\n\t\t\tjson          : `Field must be a parsable JSON object string`,\n\t\t\tmaximum       : `Field must not be greater than '[PARAM]' in size or character length`,\n\t\t\tminimum       : `Field must not be less than '[PARAM]' in size or character length`,\n\t\t\tnotIn         : `Field must not be one of the following options: [PARAM]`,\n\t\t\tnumeric       : `Field must be numeric`,\n\t\t\toptional      : `Field is optional`,\n\t\t\tregexMatch    : `Field must satisify the regular expression: [PARAM]`,\n\t\t\trequired      : `Field must be present`,\n\t\t\tsame          : `Field must be '[PARAM]'`,\n\t\t\tstartingWith  : `Field must start with '[PARAM]'`,\n\t\t\tstring        : `Field must be a string`,\n\t\t\ttruthy        : `Field must be a truthy value (true, 'true', 1 or '1')`,\n\t\t\turl           : `Field must be a valid url`,\n\t\t\tuuid          : `Field must be a valid UUID`,\n\t\t};\n\t}\n\n\n\n\t/**\n\t * Retrieve an error message for the given rule.\n\t *\n\t **/\n\tgetErrorMessage(rule, arg = null)\n\t{\n\t\tlet key   = rule.split(':')[0];\n\t\tlet param = arg || rule.split(':')[1];\n\n\t\tif (['after', 'afterOrEqual', 'before', 'beforeOrEqual'].includes(key)) {\n\t\t\tparam = new Date(parseInt(param)).toLocaleTimeString(undefined, {\n\t\t\t\tyear: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: 'numeric'\n\t\t\t});\n\t\t}\n\n\t\treturn param === undefined\n\t\t\t ? this.messages[key]\n\t\t\t : this.messages[key].replace(\"[PARAM]\", param);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after another given date.\n\t *\n\t **/\n\tisAfter(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after or equal to another given date.\n\t *\n\t **/\n\tisAfterOrEqual(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an array.\n\t *\n\t **/\n\tisArray(value)\n\t{\n\t\treturn Array.isArray(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before another given date.\n\t *\n\t **/\n\tisBefore(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before or equal to another given date.\n\t *\n\t **/\n\tisBeforeOrEqual(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a boolean.\n\t *\n\t **/\n\tisBoolean(value)\n\t{\n\t\treturn [true, false].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a date object.\n\t *\n\t **/\n\tisDate(value)\n\t{\n\t\treturn value && Object.prototype.toString.call(value) === '[object Date]' && ! isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\toptions = typeof options === 'string'\n\t\t\t\t? options.split(\",\")\n\t\t\t\t: options;\n\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! this.isIn(value, options);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is numeric (an integer or a float).\n\t *\n\t **/\n\tisNumeric(value)\n\t{\n\t\treturn ! isNaN(parseFloat(value)) && isFinite(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is optional.\n\t *\n\t **/\n\tisOptional(value)\n\t{\n\t\treturn [null, undefined, ''].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value satisifies the given regular expression.\n\t *\n\t **/\n\tisRegexMatch(value, expression)\n\t{\n\t\treturn new RegExp(expression).test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is present.\n\t *\n\t **/\n\tisRequired(value)\n\t{\n\t\treturn ! this.isOptional(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is the same as another given value.\n\t *\n\t **/\n\tisSame(value, different)\n\t{\n\t\treturn value === different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value starts with another given value.\n\t *\n\t **/\n\tisStartingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.startsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a string.\n\t *\n\t **/\n\tisString(value)\n\t{\n\t\treturn typeof value === 'string';\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is truthy.\n\t *\n\t **/\n\tisTruthy(value)\n\t{\n\t\treturn [1, '1', true, 'true'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid URL.\n\t *\n\t **/\n\tisUrl(value)\n\t{\n\t\treturn new RegExp('^(https?:\\\\/\\\\/)?((([a-z\\\\d]([a-z\\\\d-]*[a-z\\\\d])*)\\\\.)+[a-z]{2,}|((\\\\d{1,3}\\\\.){3}\\\\d{1,3}))(\\\\:\\\\d+)?(\\\\/[-a-z\\\\d%_.~+]*)*(\\\\?[;&a-z\\\\d%_.~+=-]*)?(\\\\#[-a-z\\\\d_]*)?$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid UUID.\n\t *\n\t **/\n\tisUuid(value)\n\t{\n\t\treturn new RegExp('^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine whether the given value meets the given rules.\n\t *\n\t **/\n\tis(value, rules = [])\n\t{\n\t\t// Check if no rules were specified\n\t\tif (rules.length === 0) return true;\n\n\t\t// Check for an optional value\n\t\tif (rules[0] === 'optional' && this.isOptional(value)) return true;\n\n\t\t// Iterate through the rules\n\t\tfor (let index = 0; index < rules.length; index++) {\n\n\t\t\t// Ignore optional rules\n\t\t\tif (rules[index] === 'optional') continue;\n\n\t\t\t// Determine the method to use\n\t\t\tlet rule = rules[index].split(':')[0][0].toUpperCase()\n\t\t\t\t\t + rules[index].split(':')[0].slice(1);\n\n\t\t\t// Validate the value against the method\n\t\t\tlet result = this[`is${rule}`].apply(this, [value, rules[index].split(':')[1]]);\n\n\t\t\t// Check if the value failed validation\n\t\t\tif (! 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diff --git a/dist/iodine.min.mjs b/dist/iodine.min.mjs
index e10b708..cd1e2b1 100644
--- a/dist/iodine.min.mjs
+++ b/dist/iodine.min.mjs
@@ -1,2 +1,2 @@
-var t=function(){};t.prototype._dateCompare=function(t,e,r,n){return void 0===n&&(n=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&n?t.getTime()<=e:"less"!==r||n?"more"===r&&n?t.getTime()>=e:"more"!==r||n?void 0:t.getTime()>e:t.getTime()<e)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return e.includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!e.includes(t)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r].split(":")[0];return!0},window.Iodine=new t;export default t;
+var t=function(){this.messages=this._defaultMessages()};t.prototype._dateCompare=function(t,e,r,i){return void 0===i&&(i=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&i?t.getTime()<=e:"less"!==r||i?"more"===r&&i?t.getTime()>=e:"more"!==r||i?void 0:t.getTime()>e:t.getTime()<e)},t.prototype._defaultMessages=function(){return{after:"The date must be after: '[PARAM]'",afterOrEqual:"The date must be after or equal to: '[PARAM]'",array:"Field must be an array",before:"The date must be before: '[PARAM]'",beforeOrEqual:"The date must be before or equal to: '[PARAM]'",boolean:"Field must be true or false",date:"Field must be a date",different:"Field must be different to '[PARAM]'",endingWith:"Field must end with '[PARAM]'",email:"Field must be a valid email address",falsy:"Field must be a falsy value (false, 'false', 0 or '0')",in:"Field must be one of the following options: [PARAM]",integer:"Field must be an integer",json:"Field must be a parsable JSON object string",maximum:"Field must not be greater than '[PARAM]' in size or character length",minimum:"Field must not be less than '[PARAM]' in size or character length",notIn:"Field must not be one of the following options: [PARAM]",numeric:"Field must be numeric",optional:"Field is optional",regexMatch:"Field must satisify the regular expression: [PARAM]",required:"Field must be present",same:"Field must be '[PARAM]'",startingWith:"Field must start with '[PARAM]'",string:"Field must be a string",truthy:"Field must be a truthy value (true, 'true', 1 or '1')",url:"Field must be a valid url",uuid:"Field must be a valid UUID"}},t.prototype.getErrorMessage=function(t,e){void 0===e&&(e=null);var r=t.split(":")[0],i=e||t.split(":")[1];return["after","afterOrEqual","before","beforeOrEqual"].includes(r)&&(i=new Date(parseInt(i)).toLocaleTimeString(void 0,{year:"numeric",month:"short",day:"numeric",hour:"2-digit",minute:"numeric"})),void 0===i?this.messages[r]:this.messages[r].replace("[PARAM]",i)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return(e="string"==typeof e?e.split(","):e).includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!this.isIn(t,e)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r];return!0},t.prototype.setErrorMessages=function(t){this.messages=t},window.Iodine=new t;export default t;
 //# sourceMappingURL=iodine.min.mjs.map
diff --git a/dist/iodine.min.mjs.map b/dist/iodine.min.mjs.map
index 86b6be6..dc19032 100644
--- a/dist/iodine.min.mjs.map
+++ b/dist/iodine.min.mjs.map
@@ -1 +1 @@
-{"version":3,"file":"iodine.min.mjs","sources":["../src/iodine.js"],"sourcesContent":["/*\n|--------------------------------------------------------------------------\n| Iodine - JavaScript Library\n|--------------------------------------------------------------------------\n|\n| This library contains a collection of useful validation rules that can\n| be used to quickly verify whether items meet certain conditions.\n|\n*/\nexport default class Iodine\n{\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_dateCompare(first, second, type, equals = false)\n\t{\n\t\tif (! this.isDate(first)) return false;\n\n\t\tif (! this.isDate(second) && ! this.isInteger(second)) return false;\n\n\t\tsecond = typeof second === 'number' ? second : second.getTime();\n\n\t\tif (type === 'less' && equals) return first.getTime() <= second;\n\t\tif (type === 'less' && ! equals) return first.getTime() < second;\n\t\tif (type === 'more' && equals) return first.getTime() >= second;\n\t\tif (type === 'more' && ! equals) return first.getTime() > second;\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after another given date.\n\t *\n\t **/\n\tisAfter(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after or equal to another given date.\n\t *\n\t **/\n\tisAfterOrEqual(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an array.\n\t *\n\t **/\n\tisArray(value)\n\t{\n\t\treturn Array.isArray(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before another given date.\n\t *\n\t **/\n\tisBefore(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before or equal to another given date.\n\t *\n\t **/\n\tisBeforeOrEqual(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a boolean.\n\t *\n\t **/\n\tisBoolean(value)\n\t{\n\t\treturn [true, false].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a date object.\n\t *\n\t **/\n\tisDate(value)\n\t{\n\t\treturn value && Object.prototype.toString.call(value) === '[object Date]' && ! isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! 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+{"version":3,"file":"iodine.min.mjs","sources":["../src/iodine.js"],"sourcesContent":["/*\n|--------------------------------------------------------------------------\n| Iodine - JavaScript Library\n|--------------------------------------------------------------------------\n|\n| This library contains a collection of useful validation rules that can\n| be used to quickly verify whether items meet certain conditions.\n|\n*/\nexport default class Iodine\n{\n\n\t/**\n\t * Constructor.\n\t *\n\t **/\n\tconstructor()\n\t{\n\t\tthis.messages = this._defaultMessages();\n\t}\n\n\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_dateCompare(first, second, type, equals = false)\n\t{\n\t\tif (! this.isDate(first)) return false;\n\n\t\tif (! this.isDate(second) && ! this.isInteger(second)) return false;\n\n\t\tsecond = typeof second === 'number' ? second : second.getTime();\n\n\t\tif (type === 'less' && equals) return first.getTime() <= second;\n\t\tif (type === 'less' && ! equals) return first.getTime() < second;\n\t\tif (type === 'more' && equals) return first.getTime() >= second;\n\t\tif (type === 'more' && ! 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isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\toptions = typeof options === 'string'\n\t\t\t\t? options.split(\",\")\n\t\t\t\t: options;\n\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! 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diff --git a/dist/iodine.min.umd.js b/dist/iodine.min.umd.js
index c25a438..1c0c1be 100644
--- a/dist/iodine.min.umd.js
+++ b/dist/iodine.min.umd.js
@@ -1,2 +1,2 @@
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.iodine=e()}(this,function(){var t=function(){};return t.prototype._dateCompare=function(t,e,r,n){return void 0===n&&(n=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&n?t.getTime()<=e:"less"!==r||n?"more"===r&&n?t.getTime()>=e:"more"!==r||n?void 0:t.getTime()>e:t.getTime()<e)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return e.includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!e.includes(t)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r].split(":")[0];return!0},window.Iodine=new t,t});
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeof define&&define.amd?define(e):t.iodine=e()}(this,function(){var t=function(){this.messages=this._defaultMessages()};return t.prototype._dateCompare=function(t,e,r,i){return void 0===i&&(i=!1),!!this.isDate(t)&&!(!this.isDate(e)&&!this.isInteger(e))&&(e="number"==typeof e?e:e.getTime(),"less"===r&&i?t.getTime()<=e:"less"!==r||i?"more"===r&&i?t.getTime()>=e:"more"!==r||i?void 0:t.getTime()>e:t.getTime()<e)},t.prototype._defaultMessages=function(){return{after:"The date must be after: '[PARAM]'",afterOrEqual:"The date must be after or equal to: '[PARAM]'",array:"Field must be an array",before:"The date must be before: '[PARAM]'",beforeOrEqual:"The date must be before or equal to: '[PARAM]'",boolean:"Field must be true or false",date:"Field must be a date",different:"Field must be different to '[PARAM]'",endingWith:"Field must end with '[PARAM]'",email:"Field must be a valid email address",falsy:"Field must be a falsy value (false, 'false', 0 or '0')",in:"Field must be one of the following options: [PARAM]",integer:"Field must be an integer",json:"Field must be a parsable JSON object string",maximum:"Field must not be greater than '[PARAM]' in size or character length",minimum:"Field must not be less than '[PARAM]' in size or character length",notIn:"Field must not be one of the following options: [PARAM]",numeric:"Field must be numeric",optional:"Field is optional",regexMatch:"Field must satisify the regular expression: [PARAM]",required:"Field must be present",same:"Field must be '[PARAM]'",startingWith:"Field must start with '[PARAM]'",string:"Field must be a string",truthy:"Field must be a truthy value (true, 'true', 1 or '1')",url:"Field must be a valid url",uuid:"Field must be a valid UUID"}},t.prototype.getErrorMessage=function(t,e){void 0===e&&(e=null);var r=t.split(":")[0],i=e||t.split(":")[1];return["after","afterOrEqual","before","beforeOrEqual"].includes(r)&&(i=new Date(parseInt(i)).toLocaleTimeString(void 0,{year:"numeric",month:"short",day:"numeric",hour:"2-digit",minute:"numeric"})),void 0===i?this.messages[r]:this.messages[r].replace("[PARAM]",i)},t.prototype.isAfter=function(t,e){return this._dateCompare(t,e,"more",!1)},t.prototype.isAfterOrEqual=function(t,e){return this._dateCompare(t,e,"more",!0)},t.prototype.isArray=function(t){return Array.isArray(t)},t.prototype.isBefore=function(t,e){return this._dateCompare(t,e,"less",!1)},t.prototype.isBeforeOrEqual=function(t,e){return this._dateCompare(t,e,"less",!0)},t.prototype.isBoolean=function(t){return[!0,!1].includes(t)},t.prototype.isDate=function(t){return t&&"[object Date]"===Object.prototype.toString.call(t)&&!isNaN(t)},t.prototype.isDifferent=function(t,e){return t!==e},t.prototype.isEndingWith=function(t,e){return this.isString(t)&&t.endsWith(e)},t.prototype.isEmail=function(t){return new RegExp("^\\S+@\\S+[\\.][0-9a-z]+$").test(String(t).toLowerCase())},t.prototype.isFalsy=function(t){return[0,"0",!1,"false"].includes(t)},t.prototype.isIn=function(t,e){return(e="string"==typeof e?e.split(","):e).includes(t)},t.prototype.isInteger=function(t){return Number.isInteger(t)&&parseInt(t).toString()===t.toString()},t.prototype.isJson=function(t){try{return"object"==typeof JSON.parse(t)}catch(t){return!1}},t.prototype.isMaximum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)<=e},t.prototype.isMinimum=function(t,e){return t="string"==typeof t?t.length:t,parseFloat(t)>=e},t.prototype.isNotIn=function(t,e){return!this.isIn(t,e)},t.prototype.isNumeric=function(t){return!isNaN(parseFloat(t))&&isFinite(t)},t.prototype.isOptional=function(t){return[null,void 0,""].includes(t)},t.prototype.isRegexMatch=function(t,e){return new RegExp(e).test(String(t).toLowerCase())},t.prototype.isRequired=function(t){return!this.isOptional(t)},t.prototype.isSame=function(t,e){return t===e},t.prototype.isStartingWith=function(t,e){return this.isString(t)&&t.startsWith(e)},t.prototype.isString=function(t){return"string"==typeof t},t.prototype.isTruthy=function(t){return[1,"1",!0,"true"].includes(t)},t.prototype.isUrl=function(t){return new RegExp("^(https?:\\/\\/)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(\\#[-a-z\\d_]*)?$").test(String(t).toLowerCase())},t.prototype.isUuid=function(t){return new RegExp("^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$").test(String(t).toLowerCase())},t.prototype.is=function(t,e){if(void 0===e&&(e=[]),0===e.length)return!0;if("optional"===e[0]&&this.isOptional(t))return!0;for(var r=0;r<e.length;r++)if("optional"!==e[r]&&!this["is"+(e[r].split(":")[0][0].toUpperCase()+e[r].split(":")[0].slice(1))].apply(this,[t,e[r].split(":")[1]]))return e[r];return!0},t.prototype.setErrorMessages=function(t){this.messages=t},window.Iodine=new t,t});
 //# sourceMappingURL=iodine.min.umd.js.map
diff --git a/dist/iodine.min.umd.js.map b/dist/iodine.min.umd.js.map
index 067c1ca..fd82ef4 100644
--- a/dist/iodine.min.umd.js.map
+++ b/dist/iodine.min.umd.js.map
@@ -1 +1 @@
-{"version":3,"file":"iodine.min.umd.js","sources":["../src/iodine.js"],"sourcesContent":["/*\n|--------------------------------------------------------------------------\n| Iodine - JavaScript Library\n|--------------------------------------------------------------------------\n|\n| This library contains a collection of useful validation rules that can\n| be used to quickly verify whether items meet certain conditions.\n|\n*/\nexport default class Iodine\n{\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_dateCompare(first, second, type, equals = false)\n\t{\n\t\tif (! this.isDate(first)) return false;\n\n\t\tif (! this.isDate(second) && ! this.isInteger(second)) return false;\n\n\t\tsecond = typeof second === 'number' ? second : second.getTime();\n\n\t\tif (type === 'less' && equals) return first.getTime() <= second;\n\t\tif (type === 'less' && ! equals) return first.getTime() < second;\n\t\tif (type === 'more' && equals) return first.getTime() >= second;\n\t\tif (type === 'more' && ! equals) return first.getTime() > second;\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after another given date.\n\t *\n\t **/\n\tisAfter(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after or equal to another given date.\n\t *\n\t **/\n\tisAfterOrEqual(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an array.\n\t *\n\t **/\n\tisArray(value)\n\t{\n\t\treturn Array.isArray(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before another given date.\n\t *\n\t **/\n\tisBefore(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before or equal to another given date.\n\t *\n\t **/\n\tisBeforeOrEqual(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a boolean.\n\t *\n\t **/\n\tisBoolean(value)\n\t{\n\t\treturn [true, false].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a date object.\n\t *\n\t **/\n\tisDate(value)\n\t{\n\t\treturn value && Object.prototype.toString.call(value) === '[object Date]' && ! isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is numeric (an integer or a float).\n\t *\n\t **/\n\tisNumeric(value)\n\t{\n\t\treturn ! isNaN(parseFloat(value)) && isFinite(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is optional.\n\t *\n\t **/\n\tisOptional(value)\n\t{\n\t\treturn [null, undefined, ''].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value satisifies the given regular expression.\n\t *\n\t **/\n\tisRegexMatch(value, expression)\n\t{\n\t\treturn new RegExp(expression).test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is present.\n\t *\n\t **/\n\tisRequired(value)\n\t{\n\t\treturn ! this.isOptional(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is the same as another given value.\n\t *\n\t **/\n\tisSame(value, different)\n\t{\n\t\treturn value === different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value starts with another given value.\n\t *\n\t **/\n\tisStartingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.startsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a string.\n\t *\n\t **/\n\tisString(value)\n\t{\n\t\treturn typeof value === 'string';\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is truthy.\n\t *\n\t **/\n\tisTruthy(value)\n\t{\n\t\treturn [1, '1', true, 'true'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid URL.\n\t *\n\t **/\n\tisUrl(value)\n\t{\n\t\treturn new RegExp('^(https?:\\\\/\\\\/)?((([a-z\\\\d]([a-z\\\\d-]*[a-z\\\\d])*)\\\\.)+[a-z]{2,}|((\\\\d{1,3}\\\\.){3}\\\\d{1,3}))(\\\\:\\\\d+)?(\\\\/[-a-z\\\\d%_.~+]*)*(\\\\?[;&a-z\\\\d%_.~+=-]*)?(\\\\#[-a-z\\\\d_]*)?$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid UUID.\n\t *\n\t **/\n\tisUuid(value)\n\t{\n\t\treturn new RegExp('^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine whether the given value meets the given rules.\n\t *\n\t **/\n\tis(value, rules = [])\n\t{\n\t\t// Check if no rules were specified\n\t\tif (rules.length === 0) return true;\n\n\t\t// Check for an optional value\n\t\tif (rules[0] === 'optional' && this.isOptional(value)) return true;\n\n\t\t// Iterate through the rules\n\t\tfor (let index = 0; index < rules.length; index++) {\n\n\t\t\t// Ignore optional rules\n\t\t\tif (rules[index] === 'optional') continue;\n\n\t\t\t// Determine the method to use\n\t\t\tlet rule = rules[index].split(':')[0][0].toUpperCase()\n\t\t\t\t\t + rules[index].split(':')[0].slice(1);\n\n\t\t\t// Validate the value against the method\n\t\t\tlet result = this[`is${rule}`].apply(this, [value, rules[index].split(':')[1]]);\n\n\t\t\t// Check if the value failed validation\n\t\t\tif (! 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+{"version":3,"file":"iodine.min.umd.js","sources":["../src/iodine.js"],"sourcesContent":["/*\n|--------------------------------------------------------------------------\n| Iodine - JavaScript Library\n|--------------------------------------------------------------------------\n|\n| This library contains a collection of useful validation rules that can\n| be used to quickly verify whether items meet certain conditions.\n|\n*/\nexport default class Iodine\n{\n\n\t/**\n\t * Constructor.\n\t *\n\t **/\n\tconstructor()\n\t{\n\t\tthis.messages = this._defaultMessages();\n\t}\n\n\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_dateCompare(first, second, type, equals = false)\n\t{\n\t\tif (! this.isDate(first)) return false;\n\n\t\tif (! this.isDate(second) && ! this.isInteger(second)) return false;\n\n\t\tsecond = typeof second === 'number' ? second : second.getTime();\n\n\t\tif (type === 'less' && equals) return first.getTime() <= second;\n\t\tif (type === 'less' && ! equals) return first.getTime() < second;\n\t\tif (type === 'more' && equals) return first.getTime() >= second;\n\t\tif (type === 'more' && ! equals) return first.getTime() > second;\n\t}\n\n\n\n\t/**\n\t * @internal.\n\t *\n\t **/\n\t_defaultMessages()\n\t{\n\t\treturn {\n\t\t\tafter         : `The date must be after: '[PARAM]'`,\n\t\t\tafterOrEqual  : `The date must be after or equal to: '[PARAM]'`,\n\t\t\tarray         : `Field must be an array`,\n\t\t\tbefore        : `The date must be before: '[PARAM]'`,\n\t\t\tbeforeOrEqual : `The date must be before or equal to: '[PARAM]'`,\n\t\t\tboolean       : `Field must be true or false`,\n\t\t\tdate          : `Field must be a date`,\n\t\t\tdifferent     : `Field must be different to '[PARAM]'`,\n\t\t\tendingWith    : `Field must end with '[PARAM]'`,\n\t\t\temail         : `Field must be a valid email address`,\n\t\t\tfalsy         : `Field must be a falsy value (false, 'false', 0 or '0')`,\n\t\t\tin     \t\t  : `Field must be one of the following options: [PARAM]`,\n\t\t\tinteger       : `Field must be an integer`,\n\t\t\tjson          : `Field must be a parsable JSON object string`,\n\t\t\tmaximum       : `Field must not be greater than '[PARAM]' in size or character length`,\n\t\t\tminimum       : `Field must not be less than '[PARAM]' in size or character length`,\n\t\t\tnotIn         : `Field must not be one of the following options: [PARAM]`,\n\t\t\tnumeric       : `Field must be numeric`,\n\t\t\toptional      : `Field is optional`,\n\t\t\tregexMatch    : `Field must satisify the regular expression: [PARAM]`,\n\t\t\trequired      : `Field must be present`,\n\t\t\tsame          : `Field must be '[PARAM]'`,\n\t\t\tstartingWith  : `Field must start with '[PARAM]'`,\n\t\t\tstring        : `Field must be a string`,\n\t\t\ttruthy        : `Field must be a truthy value (true, 'true', 1 or '1')`,\n\t\t\turl           : `Field must be a valid url`,\n\t\t\tuuid          : `Field must be a valid UUID`,\n\t\t};\n\t}\n\n\n\n\t/**\n\t * Retrieve an error message for the given rule.\n\t *\n\t **/\n\tgetErrorMessage(rule, arg = null)\n\t{\n\t\tlet key   = rule.split(':')[0];\n\t\tlet param = arg || rule.split(':')[1];\n\n\t\tif (['after', 'afterOrEqual', 'before', 'beforeOrEqual'].includes(key)) {\n\t\t\tparam = new Date(parseInt(param)).toLocaleTimeString(undefined, {\n\t\t\t\tyear: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: 'numeric'\n\t\t\t});\n\t\t}\n\n\t\treturn param === undefined\n\t\t\t ? this.messages[key]\n\t\t\t : this.messages[key].replace(\"[PARAM]\", param);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after another given date.\n\t *\n\t **/\n\tisAfter(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is after or equal to another given date.\n\t *\n\t **/\n\tisAfterOrEqual(value, after)\n\t{\n\t\treturn this._dateCompare(value, after, 'more', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an array.\n\t *\n\t **/\n\tisArray(value)\n\t{\n\t\treturn Array.isArray(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before another given date.\n\t *\n\t **/\n\tisBefore(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', false);\n\t}\n\n\n\n\t/**\n\t * Determine if the given date is before or equal to another given date.\n\t *\n\t **/\n\tisBeforeOrEqual(value, before)\n\t{\n\t\treturn this._dateCompare(value, before, 'less', true);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a boolean.\n\t *\n\t **/\n\tisBoolean(value)\n\t{\n\t\treturn [true, false].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a date object.\n\t *\n\t **/\n\tisDate(value)\n\t{\n\t\treturn value && Object.prototype.toString.call(value) === '[object Date]' && ! isNaN(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is different to another given value.\n\t *\n\t **/\n\tisDifferent(value, different)\n\t{\n\t\treturn value !== different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value ends with another given value.\n\t *\n\t **/\n\tisEndingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.endsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid email address.\n\t *\n\t **/\n\tisEmail(value)\n\t{\n\t\treturn new RegExp('^\\\\S+@\\\\S+[\\\\.][0-9a-z]+$').test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is falsy.\n\t *\n\t **/\n\tisFalsy(value)\n\t{\n\t\treturn [0, '0', false, 'false'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is within the given array of options.\n\t *\n\t **/\n\tisIn(value, options)\n\t{\n\t\toptions = typeof options === 'string'\n\t\t\t\t? options.split(\",\")\n\t\t\t\t: options;\n\n\t\treturn options.includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is an integer.\n\t *\n\t **/\n\tisInteger(value)\n\t{\n\t\treturn Number.isInteger(value) && parseInt(value).toString() === value.toString();\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a JSON string.\n\t *\n\t **/\n\tisJson(value)\n\t{\n\t\ttry {\n        \treturn typeof JSON.parse(value) === 'object';\n\t\t} catch (e) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given maximum limit.\n\t *\n\t **/\n\tisMaximum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) <= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value meets the given minimum limit.\n\t *\n\t **/\n\tisMinimum(value, limit)\n\t{\n\t\tvalue = typeof value === 'string' ? value.length : value;\n\n\t\treturn parseFloat(value) >= limit;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is not within the given array of options.\n\t *\n\t **/\n\tisNotIn(value, options)\n\t{\n\t\treturn ! this.isIn(value, options);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is numeric (an integer or a float).\n\t *\n\t **/\n\tisNumeric(value)\n\t{\n\t\treturn ! isNaN(parseFloat(value)) && isFinite(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is optional.\n\t *\n\t **/\n\tisOptional(value)\n\t{\n\t\treturn [null, undefined, ''].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value satisifies the given regular expression.\n\t *\n\t **/\n\tisRegexMatch(value, expression)\n\t{\n\t\treturn new RegExp(expression).test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is present.\n\t *\n\t **/\n\tisRequired(value)\n\t{\n\t\treturn ! this.isOptional(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is the same as another given value.\n\t *\n\t **/\n\tisSame(value, different)\n\t{\n\t\treturn value === different;\n\t}\n\n\n\n\t/**\n\t * Determine if the given value starts with another given value.\n\t *\n\t **/\n\tisStartingWith(value, sub)\n\t{\n\t\treturn this.isString(value) && value.startsWith(sub);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a string.\n\t *\n\t **/\n\tisString(value)\n\t{\n\t\treturn typeof value === 'string';\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is truthy.\n\t *\n\t **/\n\tisTruthy(value)\n\t{\n\t\treturn [1, '1', true, 'true'].includes(value);\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid URL.\n\t *\n\t **/\n\tisUrl(value)\n\t{\n\t\treturn new RegExp('^(https?:\\\\/\\\\/)?((([a-z\\\\d]([a-z\\\\d-]*[a-z\\\\d])*)\\\\.)+[a-z]{2,}|((\\\\d{1,3}\\\\.){3}\\\\d{1,3}))(\\\\:\\\\d+)?(\\\\/[-a-z\\\\d%_.~+]*)*(\\\\?[;&a-z\\\\d%_.~+=-]*)?(\\\\#[-a-z\\\\d_]*)?$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine if the given value is a valid UUID.\n\t *\n\t **/\n\tisUuid(value)\n\t{\n\t\treturn new RegExp('^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$')\n\t\t\t .test(String(value).toLowerCase());\n\t}\n\n\n\n\t/**\n\t * Determine whether the given value meets the given rules.\n\t *\n\t **/\n\tis(value, rules = [])\n\t{\n\t\t// Check if no rules were specified\n\t\tif (rules.length === 0) return true;\n\n\t\t// Check for an optional value\n\t\tif (rules[0] === 'optional' && this.isOptional(value)) return true;\n\n\t\t// Iterate through the rules\n\t\tfor (let index = 0; index < rules.length; index++) {\n\n\t\t\t// Ignore optional rules\n\t\t\tif (rules[index] === 'optional') continue;\n\n\t\t\t// Determine the method to use\n\t\t\tlet rule = rules[index].split(':')[0][0].toUpperCase()\n\t\t\t\t\t + rules[index].split(':')[0].slice(1);\n\n\t\t\t// Validate the value against the method\n\t\t\tlet result = this[`is${rule}`].apply(this, [value, rules[index].split(':')[1]]);\n\n\t\t\t// Check if the value failed validation\n\t\t\tif (! result) return rules[index];\n\n\t\t}\n\n\t\t// Otherwise, the value is valid\n\t\treturn true;\n\t}\n\n\n\n\t/**\n\t * Replace the default error messages with a new set.\n\t *\n\t **/\n\tsetErrorMessages(messages)\n\t{\n\t\tthis.messages = messages;\n\t}\n\n}\n\n\n\n/**\n * Create an instance of the library.\n *\n **/\nwindow.Iodine = new Iodine();"],"names":["Iodine","constructor","messages","this","_defaultMessages","_dateCompare","first","second","type","equals","isDate","isInteger","getTime","after","afterOrEqual","array","before","beforeOrEqual","boolean","date","different","endingWith","email","falsy","in","integer","json","maximum","minimum","notIn","numeric","optional","regexMatch","required","same","startingWith","string","truthy","url","uuid","getErrorMessage","rule","arg","key","split","param","includes","Date","parseInt","toLocaleTimeString","undefined","year","month","day","hour","minute","replace","isAfter","value","isAfterOrEqual","isArray","Array","isBefore","isBeforeOrEqual","isBoolean","Object","prototype","toString","call","isNaN","isDifferent","isEndingWith","sub","isString","endsWith","isEmail","RegExp","test","String","toLowerCase","isFalsy","isIn","options","Number","isJson","JSON","parse","e","isMaximum","limit","length","parseFloat","isMinimum","isNotIn","isNumeric","isFinite","isOptional","isRegexMatch","expression","isRequired","isSame","isStartingWith","startsWith","isTruthy","isUrl","isUuid","is","rules","let","index","toUpperCase","slice","apply","setErrorMessages","window"],"mappings":"qKASe,IAAMA,EAOpBC,gBAEMC,SAAWC,KAAKC,uCAStBC,sBAAaC,EAAOC,EAAQC,EAAMC,0BAAS,KAEpCN,KAAKO,OAAOJ,OAEZH,KAAKO,OAAOH,KAAaJ,KAAKQ,UAAUJ,MAE9CA,EAA2B,iBAAXA,EAAsBA,EAASA,EAAOK,UAEzC,SAATJ,GAAmBC,EAAeH,EAAMM,WAAaL,EAC5C,SAATC,GAAqBC,EACZ,SAATD,GAAmBC,EAAeH,EAAMM,WAAaL,EAC5C,SAATC,GAAqBC,SAAeH,EAAMM,UAAYL,EAFlBD,EAAMM,UAAYL,gBAW3DH,kCAEQ,CACNS,MAAiB,oCACjBC,aAAiB,gDACjBC,MAAiB,yBACjBC,OAAiB,qCACjBC,cAAiB,iDACjBC,QAAiB,8BACjBC,KAAiB,uBACjBC,UAAiB,uCACjBC,WAAiB,gCACjBC,MAAiB,sCACjBC,MAAiB,yDACjBC,GAAc,sDACdC,QAAiB,2BACjBC,KAAiB,8CACjBC,QAAiB,uEACjBC,QAAiB,oEACjBC,MAAiB,0DACjBC,QAAiB,wBACjBC,SAAiB,oBACjBC,WAAiB,sDACjBC,SAAiB,wBACjBC,KAAiB,0BACjBC,aAAiB,kCACjBC,OAAiB,yBACjBC,OAAiB,wDACjBC,IAAiB,4BACjBC,KAAiB,2CAUnBC,yBAAgBC,EAAMC,kBAAM,UAEvBC,EAAQF,EAAKG,MAAM,KAAK,GACxBC,EAAQH,GAAOD,EAAKG,MAAM,KAAK,SAE/B,CAAC,QAAS,eAAgB,SAAU,iBAAiBE,SAASH,KACjEE,EAAQ,IAAIE,KAAKC,SAASH,IAAQI,wBAAmBC,EAAW,CAC/DC,KAAM,UAAWC,MAAO,QAASC,IAAK,UAAWC,KAAM,UAAWC,OAAQ,kBAI3DL,IAAVL,EACH1C,KAAKD,SAASyC,GACdxC,KAAKD,SAASyC,GAAKa,QAAQ,UAAWX,gBAS3CY,iBAAQC,EAAO7C,UAEPV,KAAKE,aAAaqD,EAAO7C,EAAO,QAAQ,gBAShD8C,wBAAeD,EAAO7C,UAEdV,KAAKE,aAAaqD,EAAO7C,EAAO,QAAQ,gBAShD+C,iBAAQF,UAEAG,MAAMD,QAAQF,gBAStBI,kBAASJ,EAAO1C,UAERb,KAAKE,aAAaqD,EAAO1C,EAAQ,QAAQ,gBASjD+C,yBAAgBL,EAAO1C,UAEfb,KAAKE,aAAaqD,EAAO1C,EAAQ,QAAQ,gBASjDgD,mBAAUN,SAEF,EAAC,GAAM,GAAOZ,SAASY,gBAS/BhD,gBAAOgD,UAECA,GAAmD,kBAA1CO,OAAOC,UAAUC,SAASC,KAAKV,KAAgCW,MAAMX,gBAStFY,qBAAYZ,EAAOtC,UAEXsC,IAAUtC,eASlBmD,sBAAab,EAAOc,UAEZrE,KAAKsE,SAASf,IAAUA,EAAMgB,SAASF,gBAS/CG,iBAAQjB,UAEA,IAAIkB,OAAO,6BAA6BC,KAAKC,OAAOpB,GAAOqB,4BASnEC,iBAAQtB,SAEA,CAAC,EAAG,KAAK,EAAO,SAASZ,SAASY,gBAS1CuB,cAAKvB,EAAOwB,UAEXA,EAA6B,iBAAZA,EACbA,EAAQtC,MAAM,KACdsC,GAEWpC,SAASY,gBASzB/C,mBAAU+C,UAEFyB,OAAOxE,UAAU+C,IAAUV,SAASU,GAAOS,aAAeT,EAAMS,wBASxEiB,gBAAO1B,aAGqC,iBAAtB2B,KAAKC,MAAM5B,GAC9B,MAAO6B,UACD,gBAUTC,mBAAU9B,EAAO+B,UAEhB/B,EAAyB,iBAAVA,EAAqBA,EAAMgC,OAAShC,EAE5CiC,WAAWjC,IAAU+B,eAS7BG,mBAAUlC,EAAO+B,UAEhB/B,EAAyB,iBAAVA,EAAqBA,EAAMgC,OAAShC,EAE5CiC,WAAWjC,IAAU+B,eAS7BI,iBAAQnC,EAAOwB,UAEL/E,KAAK8E,KAAKvB,EAAOwB,gBAS3BY,mBAAUpC,UAEAW,MAAMsB,WAAWjC,KAAWqC,SAASrC,gBAS/CsC,oBAAWtC,SAEH,CAAC,UAAMR,EAAW,IAAIJ,SAASY,gBASvCuC,sBAAavC,EAAOwC,UAEZ,IAAItB,OAAOsB,GAAYrB,KAAKC,OAAOpB,GAAOqB,4BASlDoB,oBAAWzC,UAEDvD,KAAK6F,WAAWtC,gBAS1B0C,gBAAO1C,EAAOtC,UAENsC,IAAUtC,eASlBiF,wBAAe3C,EAAOc,UAEdrE,KAAKsE,SAASf,IAAUA,EAAM4C,WAAW9B,gBASjDC,kBAASf,SAEgB,iBAAVA,eASf6C,kBAAS7C,SAED,CAAC,EAAG,KAAK,EAAM,QAAQZ,SAASY,gBASxC8C,eAAM9C,UAEE,IAAIkB,OAAO,yKACfC,KAAKC,OAAOpB,GAAOqB,4BASvB0B,gBAAO/C,UAEC,IAAIkB,OAAO,6EACfC,KAAKC,OAAOpB,GAAOqB,4BASvB2B,YAAGhD,EAAOiD,qBAAQ,IAGI,IAAjBA,EAAMjB,OAAc,OAAO,KAGd,aAAbiB,EAAM,IAAqBxG,KAAK6F,WAAWtC,GAAQ,OAAO,MAGzDkD,IAAIC,EAAQ,EAAGA,EAAQF,EAAMjB,OAAQmB,OAGpB,aAAjBF,EAAME,KAOG1G,WAJFwG,EAAME,GAAOjE,MAAM,KAAK,GAAG,GAAGkE,cACpCH,EAAME,GAAOjE,MAAM,KAAK,GAAGmE,MAAM,KAGPC,MAAM7G,KAAM,CAACuD,EAAOiD,EAAME,GAAOjE,MAAM,KAAK,KAG7D,OAAO+D,EAAME,UAKrB,eASRI,0BAAiB/G,QAEXA,SAAWA,GAWlBgH,OAAOlH,OAAS,IAAIA"}
\ No newline at end of file
diff --git a/resources/size.svg b/resources/size.svg
index 4985920..99c73f1 100644
--- a/resources/size.svg
+++ b/resources/size.svg
@@ -14,7 +14,7 @@
     <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="110">
         <text x="165" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="210">size</text>
         <text x="165" y="140" transform="scale(.1)" textLength="210">size</text>
-        <text x="505" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="310">1.1 kB</text>
-        <text x="505" y="140" transform="scale(.1)" textLength="310">1.1 kB</text>
+        <text x="505" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="310">1.6 kB</text>
+        <text x="505" y="140" transform="scale(.1)" textLength="310">1.6 kB</text>
     </g>
 </svg>
\ No newline at end of file
diff --git a/resources/version.svg b/resources/version.svg
index 901c7e4..edd22e6 100644
--- a/resources/version.svg
+++ b/resources/version.svg
@@ -14,7 +14,7 @@
     <g fill="#fff" text-anchor="middle" font-family="DejaVu Sans,Verdana,Geneva,sans-serif" font-size="11">
         <text x="23.5" y="15" fill="#010101" fill-opacity=".3">stable</text>
         <text x="23.5" y="14">stable</text>
-        <text x="67.5" y="15" fill="#010101" fill-opacity=".3">v1.0.0</text>
-        <text x="67.5" y="14">v1.0.0</text>
+        <text x="67.5" y="15" fill="#010101" fill-opacity=".3">v2.0.0</text>
+        <text x="67.5" y="14">v2.0.0</text>
     </g>
 </svg>
\ No newline at end of file
diff --git a/src/iodine.js b/src/iodine.js
index 9f2c9d1..ab50e17 100644
--- a/src/iodine.js
+++ b/src/iodine.js
@@ -10,6 +10,17 @@
 export default class Iodine
 {
 
+	/**
+	 * Constructor.
+	 *
+	 **/
+	constructor()
+	{
+		this.messages = this._defaultMessages();
+	}
+
+
+
 	/**
 	 * @internal.
 	 *
@@ -30,6 +41,67 @@ export default class Iodine
 
 
 
+	/**
+	 * @internal.
+	 *
+	 **/
+	_defaultMessages()
+	{
+		return {
+			after         : `The date must be after: '[PARAM]'`,
+			afterOrEqual  : `The date must be after or equal to: '[PARAM]'`,
+			array         : `Field must be an array`,
+			before        : `The date must be before: '[PARAM]'`,
+			beforeOrEqual : `The date must be before or equal to: '[PARAM]'`,
+			boolean       : `Field must be true or false`,
+			date          : `Field must be a date`,
+			different     : `Field must be different to '[PARAM]'`,
+			endingWith    : `Field must end with '[PARAM]'`,
+			email         : `Field must be a valid email address`,
+			falsy         : `Field must be a falsy value (false, 'false', 0 or '0')`,
+			in     		  : `Field must be one of the following options: [PARAM]`,
+			integer       : `Field must be an integer`,
+			json          : `Field must be a parsable JSON object string`,
+			maximum       : `Field must not be greater than '[PARAM]' in size or character length`,
+			minimum       : `Field must not be less than '[PARAM]' in size or character length`,
+			notIn         : `Field must not be one of the following options: [PARAM]`,
+			numeric       : `Field must be numeric`,
+			optional      : `Field is optional`,
+			regexMatch    : `Field must satisify the regular expression: [PARAM]`,
+			required      : `Field must be present`,
+			same          : `Field must be '[PARAM]'`,
+			startingWith  : `Field must start with '[PARAM]'`,
+			string        : `Field must be a string`,
+			truthy        : `Field must be a truthy value (true, 'true', 1 or '1')`,
+			url           : `Field must be a valid url`,
+			uuid          : `Field must be a valid UUID`,
+		};
+	}
+
+
+
+	/**
+	 * Retrieve an error message for the given rule.
+	 *
+	 **/
+	getErrorMessage(rule, arg = null)
+	{
+		let key   = rule.split(':')[0];
+		let param = arg || rule.split(':')[1];
+
+		if (['after', 'afterOrEqual', 'before', 'beforeOrEqual'].includes(key)) {
+			param = new Date(parseInt(param)).toLocaleTimeString(undefined, {
+				year: 'numeric', month: 'short', day: 'numeric', hour: '2-digit', minute: 'numeric'
+			});
+		}
+
+		return param === undefined
+			 ? this.messages[key]
+			 : this.messages[key].replace("[PARAM]", param);
+	}
+
+
+
 	/**
 	 * Determine if the given date is after another given date.
 	 *
@@ -157,6 +229,10 @@ export default class Iodine
 	 **/
 	isIn(value, options)
 	{
+		options = typeof options === 'string'
+				? options.split(",")
+				: options;
+
 		return options.includes(value);
 	}
 
@@ -220,7 +296,7 @@ export default class Iodine
 	 **/
 	isNotIn(value, options)
 	{
-		return ! options.includes(value);
+		return ! this.isIn(value, options);
 	}
 
 
@@ -363,7 +439,7 @@ export default class Iodine
 			let result = this[`is${rule}`].apply(this, [value, rules[index].split(':')[1]]);
 
 			// Check if the value failed validation
-			if (! result) return rules[index].split(':')[0];
+			if (! result) return rules[index];
 
 		}
 
@@ -371,6 +447,17 @@ export default class Iodine
 		return true;
 	}
 
+
+
+	/**
+	 * Replace the default error messages with a new set.
+	 *
+	 **/
+	setErrorMessages(messages)
+	{
+		this.messages = messages;
+	}
+
 }
 
 
diff --git a/tests/test.js b/tests/test.js
index 79c4928..0e0654e 100644
--- a/tests/test.js
+++ b/tests/test.js
@@ -173,7 +173,9 @@ test('it validates falsy values', () => {
  *
  **/
 test('it validates in list values', () => {
+    expect(Iodine.isIn('a', 'a,b,c')).toBe(true);
     expect(Iodine.isIn('a', ['a', 'b', 'c'])).toBe(true);
+    expect(Iodine.isIn('d', 'a,b,c')).toBe(false);
     expect(Iodine.isIn('d', ['a', 'b', 'c'])).toBe(false);
 });
 
@@ -239,7 +241,9 @@ test('it validates minimum values', () => {
  *
  **/
 test('it validates not in list values', () => {
+    expect(Iodine.isNotIn('d', 'a,b,c')).toBe(true);
     expect(Iodine.isNotIn('d', ['a', 'b', 'c'])).toBe(true);
+    expect(Iodine.isNotIn('a', 'a,b,c')).toBe(false);
     expect(Iodine.isNotIn('a', ['a', 'b', 'c'])).toBe(false);
 });
 
@@ -380,9 +384,37 @@ test('it validates UUID values', () => {
  **/
 test('it validates values against multiple rules', () => {
     expect(Iodine.is('5', ['required', 'string', 'minimum:1', 'maximum:5'])).toBe(true);
-    expect(Iodine.is(5, ['required', 'integer', 'minimum:7', 'maximum:10'])).toBe('minimum');
-    expect(Iodine.is(5, ['optional', 'integer', 'minimum:7', 'maximum:10'])).toBe('minimum');
+    expect(Iodine.is(5, ['required', 'integer', 'minimum:7', 'maximum:10'])).toBe('minimum:7');
+    expect(Iodine.is(5, ['optional', 'integer', 'minimum:7', 'maximum:10'])).toBe('minimum:7');
     expect(Iodine.is('', ['optional', 'integer', 'minimum:7', 'maximum:10'])).toBe(true);
     expect(Iodine.is(null, ['optional', 'integer', 'minimum:7', 'maximum:10'])).toBe(true);
     expect(Iodine.is(undefined, ['optional', 'integer', 'minimum:7', 'maximum:10'])).toBe(true);
+});
+
+
+
+/**
+ * Confirm that the 'getErrorMessage' method works correctly.
+ *
+ **/
+test('it retrieves formatted error messages for rules', () => {
+	let time = Date.UTC(2020, 4, 2, 3, 17, 0);
+    expect(Iodine.getErrorMessage('array')).toBe('Field must be an array');
+    expect(Iodine.getErrorMessage('endingWith:world')).toBe(`Field must end with 'world'`);
+    expect(Iodine.getErrorMessage('endingWith', 'world')).toBe(`Field must end with 'world'`);
+    expect(Iodine.getErrorMessage(`after:${time}`)).toBe(`The date must be after: '2 May 2020, 04:17'`);
+    expect(Iodine.getErrorMessage(`after`, time)).toBe(`The date must be after: '2 May 2020, 04:17'`);
+});
+
+
+
+/**
+ * Confirm that the default error messages can be replaced.
+ *
+ **/
+test('it can replace the default error messages', () => {
+	Iodine.setErrorMessages({ array : 'Hello world', endingWith : 'Hello, [PARAM]' })
+    expect(Iodine.getErrorMessage('array')).toBe('Hello world');
+    expect(Iodine.getErrorMessage('endingWith:John')).toBe('Hello, John');
+    expect(Iodine.getErrorMessage('endingWith', "John")).toBe('Hello, John');
 });
\ No newline at end of file