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142 lines
5.0 KiB
Markdown
142 lines
5.0 KiB
Markdown
# react-fast-compare
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The fastest deep equal comparison for React. Really fast general-purpose deep comparison.
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Great for`shouldComponentUpdate`. This is a fork of the brilliant
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[fast-deep-equal](https://github.com/epoberezkin/fast-deep-equal) with some
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extra handling for React.
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[![Travis Status][trav_img]][trav_site]
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[![AppVeyor Status][appveyor_img]][appveyor_site]
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[![npm version][npm_img]][npm_site]
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[![size_minzip][size_minzip]][size_site]
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[![size_min][size_min]][size_site]
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(Check out the [benchmarking details](#benchmarking-this-library).)
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## Install
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```sh
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$ yarn add react-fast-compare
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# or
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$ npm install react-fast-compare
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```
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## Highlights
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* ES5 compatible; works in node.js (0.10+) and browsers (IE9+)
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* deeply compares any value (besides objects with circular references)
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* handles React-specific circular references, like elements
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* checks equality Date and RegExp objects
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* should be just as fast as [fast-deep-equal](https://github.com/epoberezkin/fast-deep-equal) for general use, and faster for React use
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* small: under 600 bytes minified+gzipped
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## Usage
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```jsx
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const isEqual = require("react-fast-compare");
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// general usage
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console.log(isEqual({ foo: "bar" }, { foo: "bar" })); // true
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// react usage
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class ExpensiveRenderer extends React.Component {
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shouldComponentUpdate(nextProps) {
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return !isEqual(this.props, nextProps);
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}
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render() {
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// ...
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}
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}
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```
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## Do I Need `shouldComponentUpdate`?
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> What's faster than a really fast deep comparison? No deep comparison at all.
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—This Readme
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Deep checks in React's `shouldComponentUpdate` should not be used blindly.
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First, see if a
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[PureComponent](https://reactjs.org/docs/react-api.html#reactpurecomponent)
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would work for you. If it won't (if you need deep checks), it's wise to make
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sure you've correctly indentified the bottleneck in your application by
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[profiling the performance](https://reactjs.org/docs/optimizing-performance.html#profiling-components-with-the-chrome-performance-tab).
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After you've determined that you _do_ need deep equality checks and you've
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identified the minimum number of places to apply them, then this library may
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be for you! For more information about making your app faster, check out the
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[Optimizing Performance](https://reactjs.org/docs/optimizing-performance.html)
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section of the React docs.
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## Benchmarking this Library
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All tests carried out locally on a MacBook. The absolute values are much less
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important than the relative differences between packages.
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Benchmarking source can be found
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[here](https://github.com/FormidableLabs/react-fast-compare/blob/master/node/tests.js).
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Each "operation" consists of running all relevant tests. The React benchmark
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uses both the generic tests and the react tests; these runs will be slower
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simply because there are more tests in each operation.
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### Generic Data
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```
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react-fast-compare x 207,503 ops/sec ±0.54% (92 runs sampled)
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fast-deep-equal x 195,006 ops/sec ±0.70% (91 runs sampled)
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lodash.isEqual x 43,778 ops/sec ±0.55% (91 runs sampled)
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nano-equal x 198,036 ops/sec ±0.37% (95 runs sampled)
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shallow-equal-fuzzy x 173,023 ops/sec ±0.59% (95 runs sampled)
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fastest: react-fast-compare
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```
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`react-fast-compare` and `fast-deep-equal` should be the same speed for these
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tests; any difference is just noise. `react-fast-compare` won't be faster than
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`fast-deep-equal`, because it's based on it.
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### React and Generic Data
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```
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react-fast-compare x 187,628 ops/sec ±0.58% (93 runs sampled)
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fast-deep-equal x 477 ops/sec ±0.55% (91 runs sampled)
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lodash.isEqual x 35,100 ops/sec ±0.16% (95 runs sampled)
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nano-equal x 468 ops/sec ±0.53% (94 runs sampled)
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shallow-equal-fuzzy x 684 ops/sec ±0.43% (92 runs sampled)
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fastest: react-fast-compare
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```
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Three of these packages cannot handle comparing React elements (which are
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circular): `fast-deep-equal`, `nano-equal`, and `shallow-equal-fuzzy`.
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### Running Benchmarks
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```sh
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$ yarn install
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$ yarn run benchmark
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```
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## fast-deep-equal Versioning
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react-fast-compare@2.0.0 tracks fast-deep-equal@2.0.1
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## License
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[MIT](https://github.com/FormidableLabs/react-fast-compare/blob/readme/LICENSE)
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## Contributing
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Please see our [contributions guide](./CONTRIBUTING.md).
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[trav_img]: https://api.travis-ci.org/FormidableLabs/react-fast-compare.svg
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[trav_site]: https://travis-ci.org/FormidableLabs/react-fast-compare
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[cov_img]: https://img.shields.io/coveralls/FormidableLabs/react-fast-compare.svg
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[cov_site]: https://coveralls.io/r/FormidableLabs/react-fast-compare
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[npm_img]: https://badge.fury.io/js/react-fast-compare.svg
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[npm_site]: http://badge.fury.io/js/react-fast-compare
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[appveyor_img]: https://ci.appveyor.com/api/projects/status/github/formidablelabs/react-fast-compare?branch=master&svg=true
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[appveyor_site]: https://ci.appveyor.com/project/FormidableLabs/react-fast-compare
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[size_min]: https://img.shields.io/bundlephobia/min/react-fast-compare.svg
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[size_minzip]: https://img.shields.io/bundlephobia/minzip/react-fast-compare.svg
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[size_site]: https://bundlephobia.com/result?p=react-fast-compare
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