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291 lines
7.7 KiB
291 lines
7.7 KiB
# cache-base [](https://www.npmjs.com/package/cache-base) [](https://npmjs.org/package/cache-base) [](https://npmjs.org/package/cache-base) [](https://travis-ci.org/jonschlinkert/cache-base)
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> Basic object cache with `get`, `set`, `del`, and `has` methods for node.js/javascript projects.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save cache-base
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```
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## Usage
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```js
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var Cache = require('cache-base');
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// instantiate
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var app = new Cache();
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// set values
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app.set('a', 'b');
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app.set('c.d', 'e');
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// get values
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app.get('a');
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//=> 'b'
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app.get('c');
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//=> {d: 'e'}
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console.log(app.cache);
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//=> {a: 'b'}
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```
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**Inherit**
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```js
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var util = require('util');
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var Cache = require('cache-base');
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function MyApp() {
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Cache.call(this);
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}
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util.inherits(MyApp, Cache);
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var app = new MyApp();
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app.set('a', 'b');
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app.get('a');
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//=> 'b'
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```
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**Namespace**
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Define a custom property for storing values.
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```js
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var Cache = require('cache-base').namespace('data');
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var app = new Cache();
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app.set('a', 'b');
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console.log(app.data);
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//=> {a: 'b'}
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```
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## API
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### [namespace](index.js#L29)
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Create a `Cache` constructor that when instantiated will store values on the given `prop`.
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**Params**
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* `prop` **{String}**: The property name to use for storing values.
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* `returns` **{Function}**: Returns a custom `Cache` constructor
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**Example**
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```js
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var Cache = require('cache-base').namespace('data');
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var cache = new Cache();
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cache.set('foo', 'bar');
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//=> {data: {foo: 'bar'}}
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```
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### [Cache](index.js#L43)
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Create a new `Cache`. Internally the `Cache` constructor is created using the `namespace` function, with `cache` defined as the storage object.
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**Params**
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* `cache` **{Object}**: Optionally pass an object to initialize with.
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**Example**
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```js
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var app = new Cache();
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```
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### [.set](index.js#L84)
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Assign `value` to `key`. Also emits `set` with the key and value.
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**Params**
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* `key` **{String}**
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* `value` **{any}**
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* `returns` **{Object}**: Returns the instance for chaining.
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**Events**
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* `emits`: `set` with `key` and `value` as arguments.
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**Example**
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```js
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app.on('set', function(key, val) {
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// do something when `set` is emitted
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});
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app.set(key, value);
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// also takes an object or array
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app.set({name: 'Halle'});
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app.set([{foo: 'bar'}, {baz: 'quux'}]);
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console.log(app);
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//=> {name: 'Halle', foo: 'bar', baz: 'quux'}
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```
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### [.union](index.js#L114)
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Union `array` to `key`. Also emits `set` with the key and value.
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**Params**
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* `key` **{String}**
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* `value` **{any}**
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* `returns` **{Object}**: Returns the instance for chaining.
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**Example**
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```js
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app.union('a.b', ['foo']);
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app.union('a.b', ['bar']);
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console.log(app.get('a'));
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//=> {b: ['foo', 'bar']}
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```
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### [.get](index.js#L144)
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Return the value of `key`. Dot notation may be used to get [nested property values](https://github.com/jonschlinkert/get-value).
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**Params**
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* `key` **{String}**: The name of the property to get. Dot-notation may be used.
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* `returns` **{any}**: Returns the value of `key`
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**Events**
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* `emits`: `get` with `key` and `value` as arguments.
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**Example**
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```js
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app.set('a.b.c', 'd');
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app.get('a.b');
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//=> {c: 'd'}
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app.get(['a', 'b']);
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//=> {c: 'd'}
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```
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### [.has](index.js#L171)
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Return true if app has a stored value for `key`, false only if value is `undefined`.
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**Params**
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* `key` **{String}**
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* `returns` **{Boolean}**
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**Events**
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* `emits`: `has` with `key` and true or false as arguments.
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**Example**
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```js
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app.set('foo', 'bar');
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app.has('foo');
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//=> true
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```
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### [.del](index.js#L199)
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Delete one or more properties from the instance.
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**Params**
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* `key` **{String|Array}**: Property name or array of property names.
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* `returns` **{Object}**: Returns the instance for chaining.
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**Events**
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* `emits`: `del` with the `key` as the only argument.
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**Example**
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```js
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app.del(); // delete all
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// or
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app.del('foo');
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// or
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app.del(['foo', 'bar']);
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```
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### [.clear](index.js#L218)
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Reset the entire cache to an empty object.
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**Example**
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```js
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app.clear();
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```
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### [.visit](index.js#L235)
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Visit `method` over the properties in the given object, or map
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visit over the object-elements in an array.
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**Params**
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* `method` **{String}**: The name of the `base` method to call.
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* `val` **{Object|Array}**: The object or array to iterate over.
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* `returns` **{Object}**: Returns the instance for chaining.
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## About
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### Related projects
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* [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`.")
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* [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.")
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* [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.")
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* [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.")
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* [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.")
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* [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.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 54 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 2 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |
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### Building docs
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_(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.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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Running 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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on July 22, 2017._ |