64 lines
2.2 KiB
Markdown
64 lines
2.2 KiB
Markdown
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# shallowequal [](https://travis-ci.org/dashed/shallowequal) [](https://npmjs.com/shallowequal) [](https://www.npmjs.com/package/shallowequal)
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[](https://greenkeeper.io/)
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> `shallowequal` is like lodash's [`isEqualWith`](https://lodash.com/docs/4.17.4#isEqualWith) but for shallow (strict) equal.
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`shallowequal(value, other, [customizer], [thisArg])`
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Performs a ***shallow equality*** comparison between two values (i.e. `value` and `other`) to determine if they are equivalent.
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The equality is performed by iterating through keys on the given `value`, and returning `false` whenever any key has values which are not **strictly equal** between `value` and `other`. Otherwise, return `true` whenever the values of all keys are strictly equal.
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If `customizer` (expected to be a function) is provided it is invoked to compare values. If `customizer` returns `undefined` (i.e. `void 0`), then comparisons are handled by the `shallowequal` function instead.
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The `customizer` is bound to `thisArg` and invoked with three arguments: `(value, other, key)`.
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**NOTE:** Docs are (shamelessly) adapted from [lodash's v3.x docs](https://lodash.com/docs/3.10.1#isEqualWith)
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## Install
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```sh
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$ yarn add shallowequal
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# npm v5+
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$ npm install shallowequal
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# before npm v5
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$ npm install --save shallowequal
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```
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## Usage
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```js
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const shallowequal = require('shallowequal');
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const object = { 'user': 'fred' };
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const other = { 'user': 'fred' };
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object == other;
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// → false
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shallowequal(object, other);
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// → true
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```
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## Credit
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Code for `shallowEqual` originated from https://github.com/gaearon/react-pure-render/ and has since been refactored to have the exact same API as `lodash.isEqualWith` (as of `v4.17.4`).
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## Development
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- `node.js` and `npm`. See: https://github.com/creationix/nvm#installation
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- `yarn`. See: https://yarnpkg.com/en/docs/install
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- `npm` dependencies. Run: `yarn install`
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### Chores
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- Lint: `yarn lint`
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- Test: `yarn test`
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- Pretty: `yarn pretty`
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- Pre-publish: `yarn prepublish`
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## License
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MIT.
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