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1# cache-base [![NPM version](https://img.shields.io/npm/v/cache-base.svg?style=flat)](https://www.npmjs.com/package/cache-base) [![NPM monthly downloads](https://img.shields.io/npm/dm/cache-base.svg?style=flat)](https://npmjs.org/package/cache-base) [![NPM total downloads](https://img.shields.io/npm/dt/cache-base.svg?style=flat)](https://npmjs.org/package/cache-base) [![Linux Build Status](https://img.shields.io/travis/jonschlinkert/cache-base.svg?style=flat&label=Travis)](https://travis-ci.org/jonschlinkert/cache-base)
2
3> Basic object cache with `get`, `set`, `del`, and `has` methods for node.js/javascript projects.
4
5## Install
6
7Install with [npm](https://www.npmjs.com/):
8
9```sh
10$ npm install --save cache-base
11```
12
13## Usage
14
15```js
16var Cache = require('cache-base');
17
18// instantiate
19var app = new Cache();
20
21// set values
22app.set('a', 'b');
23app.set('c.d', 'e');
24
25// get values
26app.get('a');
27//=> 'b'
28app.get('c');
29//=> {d: 'e'}
30
31console.log(app.cache);
32//=> {a: 'b'}
33```
34
35**Inherit**
36
37```js
38var util = require('util');
39var Cache = require('cache-base');
40
41function MyApp() {
42 Cache.call(this);
43}
44util.inherits(MyApp, Cache);
45
46var app = new MyApp();
47app.set('a', 'b');
48app.get('a');
49//=> 'b'
50```
51
52**Namespace**
53
54Define a custom property for storing values.
55
56```js
57var Cache = require('cache-base').namespace('data');
58var app = new Cache();
59app.set('a', 'b');
60console.log(app.data);
61//=> {a: 'b'}
62```
63
64## API
65
66### [namespace](index.js#L29)
67
68Create a `Cache` constructor that when instantiated will store values on the given `prop`.
69
70**Params**
71
72* `prop` **{String}**: The property name to use for storing values.
73* `returns` **{Function}**: Returns a custom `Cache` constructor
74
75**Example**
76
77```js
78var Cache = require('cache-base').namespace('data');
79var cache = new Cache();
80
81cache.set('foo', 'bar');
82//=> {data: {foo: 'bar'}}
83```
84
85### [Cache](index.js#L43)
86
87Create a new `Cache`. Internally the `Cache` constructor is created using the `namespace` function, with `cache` defined as the storage object.
88
89**Params**
90
91* `cache` **{Object}**: Optionally pass an object to initialize with.
92
93**Example**
94
95```js
96var app = new Cache();
97```
98
99### [.set](index.js#L84)
100
101Assign `value` to `key`. Also emits `set` with the key and value.
102
103**Params**
104
105* `key` **{String}**
106* `value` **{any}**
107* `returns` **{Object}**: Returns the instance for chaining.
108
109**Events**
110
111* `emits`: `set` with `key` and `value` as arguments.
112
113**Example**
114
115```js
116app.on('set', function(key, val) {
117 // do something when `set` is emitted
118});
119
120app.set(key, value);
121
122// also takes an object or array
123app.set({name: 'Halle'});
124app.set([{foo: 'bar'}, {baz: 'quux'}]);
125console.log(app);
126//=> {name: 'Halle', foo: 'bar', baz: 'quux'}
127```
128
129### [.union](index.js#L114)
130
131Union `array` to `key`. Also emits `set` with the key and value.
132
133**Params**
134
135* `key` **{String}**
136* `value` **{any}**
137* `returns` **{Object}**: Returns the instance for chaining.
138
139**Example**
140
141```js
142app.union('a.b', ['foo']);
143app.union('a.b', ['bar']);
144console.log(app.get('a'));
145//=> {b: ['foo', 'bar']}
146```
147
148### [.get](index.js#L144)
149
150Return the value of `key`. Dot notation may be used to get [nested property values](https://github.com/jonschlinkert/get-value).
151
152**Params**
153
154* `key` **{String}**: The name of the property to get. Dot-notation may be used.
155* `returns` **{any}**: Returns the value of `key`
156
157**Events**
158
159* `emits`: `get` with `key` and `value` as arguments.
160
161**Example**
162
163```js
164app.set('a.b.c', 'd');
165app.get('a.b');
166//=> {c: 'd'}
167
168app.get(['a', 'b']);
169//=> {c: 'd'}
170```
171
172### [.has](index.js#L171)
173
174Return true if app has a stored value for `key`, false only if value is `undefined`.
175
176**Params**
177
178* `key` **{String}**
179* `returns` **{Boolean}**
180
181**Events**
182
183* `emits`: `has` with `key` and true or false as arguments.
184
185**Example**
186
187```js
188app.set('foo', 'bar');
189app.has('foo');
190//=> true
191```
192
193### [.del](index.js#L199)
194
195Delete one or more properties from the instance.
196
197**Params**
198
199* `key` **{String|Array}**: Property name or array of property names.
200* `returns` **{Object}**: Returns the instance for chaining.
201
202**Events**
203
204* `emits`: `del` with the `key` as the only argument.
205
206**Example**
207
208```js
209app.del(); // delete all
210// or
211app.del('foo');
212// or
213app.del(['foo', 'bar']);
214```
215
216### [.clear](index.js#L218)
217
218Reset the entire cache to an empty object.
219
220**Example**
221
222```js
223app.clear();
224```
225
226### [.visit](index.js#L235)
227
228Visit `method` over the properties in the given object, or map
229visit over the object-elements in an array.
230
231**Params**
232
233* `method` **{String}**: The name of the `base` method to call.
234* `val` **{Object|Array}**: The object or array to iterate over.
235* `returns` **{Object}**: Returns the instance for chaining.
236
237## About
238
239### Related projects
240
241* [base-methods](https://www.npmjs.com/package/base-methods): base-methods is the foundation for creating modular, unit testable and highly pluggable node.js applications, starting… [more](https://github.com/jonschlinkert/base-methods) | [homepage](https://github.com/jonschlinkert/base-methods "base-methods is the foundation for creating modular, unit testable and highly pluggable node.js applications, starting with a handful of common methods, like `set`, `get`, `del` and `use`.")
242* [get-value](https://www.npmjs.com/package/get-value): Use property paths (`a.b.c`) to get a nested value from an object. | [homepage](https://github.com/jonschlinkert/get-value "Use property paths (`a.b.c`) to get a nested value from an object.")
243* [has-value](https://www.npmjs.com/package/has-value): Returns true if a value exists, false if empty. Works with deeply nested values using… [more](https://github.com/jonschlinkert/has-value) | [homepage](https://github.com/jonschlinkert/has-value "Returns true if a value exists, false if empty. Works with deeply nested values using object paths.")
244* [option-cache](https://www.npmjs.com/package/option-cache): Simple API for managing options in JavaScript applications. | [homepage](https://github.com/jonschlinkert/option-cache "Simple API for managing options in JavaScript applications.")
245* [set-value](https://www.npmjs.com/package/set-value): Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths. | [homepage](https://github.com/jonschlinkert/set-value "Create nested values and any intermediaries using dot notation (`'a.b.c'`) paths.")
246* [unset-value](https://www.npmjs.com/package/unset-value): Delete nested properties from an object using dot notation. | [homepage](https://github.com/jonschlinkert/unset-value "Delete nested properties from an object using dot notation.")
247
248### Contributing
249
250Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
251
252### Contributors
253
254| **Commits** | **Contributor** |
255| --- | --- |
256| 54 | [jonschlinkert](https://github.com/jonschlinkert) |
257| 2 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
258
259### Building docs
260
261_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
262
263To generate the readme, run the following command:
264
265```sh
266$ npm install -g verbose/verb#dev verb-generate-readme && verb
267```
268
269### Running tests
270
271Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
272
273```sh
274$ npm install && npm test
275```
276
277### Author
278
279**Jon Schlinkert**
280
281* [github/jonschlinkert](https://github.com/jonschlinkert)
282* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
283
284### License
285
286Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
287Released under the [MIT License](LICENSE).
288
289***
290
291_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 22, 2017._
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