random.js

var mersenne = require('../vendor/mersenne');

function Random (faker, seed) {
  // Use a user provided seed if it exists
  if (seed) {
    if (Array.isArray(seed) && seed.length) {
      mersenne.seed_array(seed);
    }
    else {
      mersenne.seed(seed);
    }
  }
  // returns a single random number based on a max number or range
  this.number = function (options) {

    if (typeof options === "number") {
      options = {
        max: options
      };
    }

    options = options || {};

    if (typeof options.min === "undefined") {
      options.min = 0;
    }

    if (typeof options.max === "undefined") {
      options.max = 99999;
    }
    if (typeof options.precision === "undefined") {
      options.precision = 1;
    }

    // Make the range inclusive of the max value
    var max = options.max;
    if (max >= 0) {
      max += options.precision;
    }

    var randomNumber = options.precision * Math.floor(
      mersenne.rand(max / options.precision, options.min / options.precision));

    return randomNumber;

  }

  // takes an array and returns a random element of the array
  this.arrayElement = function (array) {
      array = array || ["a", "b", "c"];
      var r = faker.random.number({ max: array.length - 1 });
      return array[r];
  }

  // takes an object and returns the randomly key or value
  this.objectElement = function (object, field) {
      object = object || { "foo": "bar", "too": "car" };
      var array = Object.keys(object);
      var key = faker.random.arrayElement(array);

      return field === "key" ? key : object[key];
  }

  this.uuid = function () {
      var RFC4122_TEMPLATE = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
      var replacePlaceholders = function (placeholder) {
          var random = Math.random()*16|0;
          var value = placeholder == 'x' ? random : (random &0x3 | 0x8);
          return value.toString(16);
      };
      return RFC4122_TEMPLATE.replace(/[xy]/g, replacePlaceholders);
  }

  this.boolean =function () {
      return !!faker.random.number(1)
  }

  return this;

}

module['exports'] = Random;



// module.exports = random;