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| 3 | # es-toolkit · [](https://github.com/toss/slash/blob/main/LICENSE) [](https://codecov.io/gh/toss/es-toolkit) [](https://www.npmjs.com/package/es-toolkit) [](https://jsr.io/@es-toolkit/es-toolkit) [](https://discord.gg/vGXbVjP2nY)
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| 4 |
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| 5 | English | [한국어](https://github.com/toss/es-toolkit/blob/main/README-ko_kr.md) | [简体中文](https://github.com/toss/es-toolkit/blob/main/README-zh_hans.md) | [日本語](https://github.com/toss/es-toolkit/blob/main/README-ja_jp.md)
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| 6 |
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| 7 | es-toolkit is a state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.
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| 8 |
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| 9 | - es-toolkit offers a variety of everyday utility functions with modern implementations, such as [debounce](https://es-toolkit.dev/reference/function/debounce.html), [delay](https://es-toolkit.dev/reference/promise/delay.html), [chunk](https://es-toolkit.dev/reference/array/chunk.html), [sum](https://es-toolkit.dev/reference/math/sum.html), and [pick](https://es-toolkit.dev/reference/object/pick.html).
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| 10 | - Designed with performance in mind, es-toolkit achieves [2-3× better performance](https://es-toolkit.dev/performance.html) in modern JavaScript environments.
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| 11 | - es-toolkit supports tree shaking out of the box, and [reduces JavaScript code by up to 97%](https://es-toolkit.dev/bundle-size.html) compared to other libraries.
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| 12 | - es-toolkit offers a complete compatibility layer to seamlessly replace lodash, available as [es-toolkit/compat](https://es-toolkit.dev/compatibility.html).
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| 13 | - es-toolkit includes built-in TypeScript support, with straightforward yet robust types. It also provides useful type guards such as [isNotNil](https://es-toolkit.dev/reference/predicate/isNotNil.html).
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| 14 | - es-toolkit is trusted and used by popular open-source projects like [Storybook](https://github.com/storybookjs/storybook/blob/9d862798d666678cc4822e857c00bbd744169ced/code/core/package.json#L358), Recharts, ink, and CKEditor.
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| 15 | - es-toolkit is battle-tested with 100% test coverage, ensuring reliability and robustness.
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| 16 |
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| 17 | ## Examples
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| 18 |
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| 19 | ```tsx
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| 20 | // import from '@es-toolkit/es-toolkit' in jsr.
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| 21 | import { chunk, debounce } from 'es-toolkit';
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| 22 |
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| 23 | const debouncedLog = debounce(message => {
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| 24 | console.log(message);
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| 25 | }, 300);
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| 26 |
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| 27 | // This call will be debounced
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| 28 | debouncedLog('Hello, world!');
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| 29 |
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| 30 | const array = [1, 2, 3, 4, 5, 6];
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| 31 | const chunkedArray = chunk(array, 2);
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| 32 |
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| 33 | console.log(chunkedArray);
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| 34 | // Output: [[1, 2], [3, 4], [5, 6]]
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| 35 | ```
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| 36 |
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| 37 | ## Contributing
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| 38 |
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| 39 | We welcome contribution from everyone in the community. Read below for detailed contribution guide.
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| 40 |
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| 41 | [CONTRIBUTING](https://github.com/toss/es-toolkit/blob/main/.github/CONTRIBUTING.md)
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| 42 |
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| 43 | ## License
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| 44 |
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| 45 | MIT © Viva Republica, Inc. See [LICENSE](./LICENSE) for details.
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| 46 |
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| 47 | <a title="Toss" href="https://toss.im">
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| 48 | <picture>
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| 49 | <source media="(prefers-color-scheme: dark)" srcset="https://static.toss.im/logos/png/4x/logo-toss-reverse.png">
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| 50 | <img alt="Toss" src="https://static.toss.im/logos/png/4x/logo-toss.png" width="100">
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| 51 | </picture>
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| 52 | </a>
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