lowstore

The purposes is to have a convenient state store that emits an event when it's changed.

npm install lowstore

Platforms:

• node
• electron
• browser dist/lowstore.min.js
• webpack

It uses these powerful lodash functions underneath:

• _.get
• _.set

Create a lowstore

var lowstore = require("lowstore");
var store = lowstore();

Store members

• property store.internal
• function store.get → object
• void store.set path, val
• void store.hset path, subpath, val
• void store.push path, val
• void store.removeIndex path, index
• void store.toggle path, val1, val2
• void store.assign [path], val
• void store.merge [path], val

Access the state

• object store.internal

console.log("store.internal", store.internal)
// store.internal {}

Changes

store is an EventEmitter

It just has one event: store-change

store.on("store-change", function() {
  console.log("store changed", store.internal)
});

store.get

• string path

returns object or undefined

var val = store.get("key1.key2");
// → val === undefined

store.set("key1.key2", "twinkle");
val = val.get("key1.key2");
// → val === "twinkle"

It returns anything that it was store.set to. If nothing was ever set it returns undefined.

There's unlimited nesting: one.two.three.four.five[6].seven[8]

See _.get for how this works.

store.set

• string path
• object val

store.set("key1.key2", "hi")
// → store.internal === { key1: { key2: "hi" } }

var val = store.get("key1.key2");
// → val === "hi"

Set val to to any type of value. Most of the functions use store.set internally.

See _.set for more.

store.hset

• string path
• string subpath
• object val

store.hset("key1.key2", "key3", "three");
// → store.internal === { key1: { key2: { key3: "three" } } }

var val = store.get("key1.key2.key3");
// → val === "three"

store.hset is inspired by Redis' hash set operation. It sets an object property.

store.push

• string path
• object val

Push an item onto an Array.

store.push("key1.key2", "first!");
// → store.internal === { key1: { key2: ["first!"] } }


store.push("key1.key2", "second");
store.push("key1.key2", "third");
// → store.internal === { key1: { key2: ["first!", "second", "third"] } }

store.removeIndex

• string path
• number index

Remove Array item by index.

store.push("key1.key2", "first!");
// → store.internal === { key1: { key2: ["first!"] } }
//
store.removeIndex("key1.key2", 0);
// → store.internal === { key1: { key2: [] } }

store.toggle

• string path
• object val1 optional
• object val2 optional

store.toggle("key1.key2", "one", "two");
// → store.internal === { key1: { key2: "one" } } <-- val1

store.toggle("key1.key2", "one", "two");
// → store.internal === { key1: { key2: "two" } } <-- val2

store.toggle("key1.key2", "one", "two");
// → store.internal === { key1: { key2: "one" } } <-- back to val1

store.toggle("happy")
// → store.internal === { happy: true, key1: { key2: "one" } } <-- true

store.toggle("happy")
// → store.internal === { happy: false, key1: { key2: "one" } } <-- false

• values are optional
• values can be Boolean, String, or Number
• no values assumes Boolean

It could be modified to do deep object comparisons.

store.assign

Performs a shallow object merge. For a deep recursive merge use store.merge(...).

• *string path optional
• object val

store.assign("key1.key2", { five: 5 });
// → store.internal === { key1: { key2: { five: 5 } } }

store.assign({ six: 6 });
// → store.internal === { six: 6, key1: { key2: { five: 5 } } }

store.merge

_.merge is different from store.assign but both are useful. Merge does a deep recursive object merge.

• *string path optional
• object val

store.merge("key1.key2", { five: 5 });
// → store.internal === { key1: { key2: { five: 5 } } }

store.merge({ six: 6 });
// → store.internal === { six: 6, key1: { key2: { five: 5 } } }

Using it without any path will just merge into state.internal.

Why use lowstore?

• The API can be mastered in less than an hour.
• People complain a lot about the difficulty state libraries.
• alternative to redux
• alternative to mobx
• client/GUI virtual-dom state
• server memory persistence
• uses mutation

Copying, license, and contributing

Copyright (C) Tony Crowe [email protected] (https://tcrowe.github.io) 2018

Thank you for using and contributing to make lowstore better.

⚠️ Please run npm run prd before submitting a patch.

⚖️ lowstore is Free Software protected by the GPL 3.0 license. See ./COPYING for more information. (free as in freedom)