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55 lines
1.7 KiB
Markdown
55 lines
1.7 KiB
Markdown
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# value-equal [![Travis][build-badge]][build] [![npm package][npm-badge]][npm]
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[build-badge]: https://img.shields.io/travis/mjackson/value-equal/master.svg?style=flat-square
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[build]: https://travis-ci.org/mjackson/value-equal
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[npm-badge]: https://img.shields.io/npm/v/value-equal.svg?style=flat-square
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[npm]: https://www.npmjs.org/package/value-equal
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[`value-equal`](https://www.npmjs.com/package/value-equal) determines if two JavaScript values are equal using [`Object.prototype.valueOf`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf).
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In many instances when I'm checking for object equality, what I really want to know is if their **values** are equal. This is good for:
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- Stuff you keep in `localStorage`
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- `window.history.state` values
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- Query strings
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## Installation
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Using [npm](https://www.npmjs.com/):
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$ npm install --save value-equal
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Then with a module bundler like [webpack](https://webpack.github.io/), use as you would anything else:
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```js
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// using ES6 modules
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import valueEqual from 'value-equal';
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// using CommonJS modules
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var valueEqual = require('value-equal');
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```
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The UMD build is also available on [unpkg](https://unpkg.com):
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```html
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<script src="https://unpkg.com/value-equal"></script>
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```
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You can find the library on `window.valueEqual`.
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## Usage
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```js
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valueEqual(1, 1); // true
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valueEqual('asdf', 'asdf'); // true
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valueEqual('asdf', new String('asdf')); // true
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valueEqual(true, true); // true
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valueEqual(true, false); // false
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valueEqual({ a: 'a' }, { a: 'a' }); // true
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valueEqual({ a: 'a' }, { a: 'b' }); // false
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valueEqual([1, 2, 3], [1, 2, 3]); // true
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valueEqual([1, 2, 3], [2, 3, 4]); // false
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```
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That's it. Enjoy!
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