es-toolkit/README.md
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# es-toolkit · [![MIT License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/toss/slash/blob/main/LICENSE) [![codecov](https://codecov.io/gh/toss/es-toolkit/graph/badge.svg?token=8N5S3AR3C7)](https://codecov.io/gh/toss/es-toolkit) [![JSR][JSR badge](https://jsr.io/badges/@es-toolkit/es-toolkit)](https://jsr.io/@es-toolkit/es-toolkit)
English | [한국어](https://github.com/toss/es-toolkit/blob/main/README-ko_kr.md)
es-toolkit is a state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.
- es-toolkit offers a variety of everyday utility functions with modern implementations, such as [debounce](https://es-toolkit.slash.page/reference/function/debounce.html), [delay](https://es-toolkit.slash.page/reference/promise/delay.html), [chunk](https://es-toolkit.slash.page/reference/array/chunk.html), [sum](https://es-toolkit.slash.page/reference/math/sum.html), and [pick](https://es-toolkit.slash.page/reference/object/pick.html).
- Designed with performance in mind, es-toolkit achieves [2-3× better performance](https://es-toolkit.slash.page/performance.html) in modern JavaScript environments.
- es-toolkit supports tree shaking out of the box, and [reduces JavaScript code by up to 97%](https://es-toolkit.slash.page/bundle-size.html) compared to other libraries.
- es-toolkit includes built-in TypeScript support, with straightforward yet robust types. It also provides useful type guards such as [isNotNil](https://es-toolkit.slash.page/reference/predicate/isNotNil.html).
- es-toolkit is battle-tested with 100% test coverage, ensuring reliability and robustness.
## Examples
```tsx
// import from '@es-toolkit/es-toolkit' in jsr.
import { debounce, chunk } from 'es-toolkit';
const debouncedLog = debounce(message => {
console.log(message);
}, 300);
// This call will be debounced
debouncedLog('Hello, world!');
const array = [1, 2, 3, 4, 5, 6];
const chunkedArray = chunk(array, 2);
console.log(chunkedArray);
// Output: [[1, 2], [3, 4], [5, 6]]
```
## Contributing
We welcome contribution from everyone in the community. Read below for detailed contribution guide.
[CONTRIBUTING](https://github.com/toss/es-toolkit/blob/main/.github/CONTRIBUTING.md)
## License
MIT © Viva Republica, Inc. See [LICENSE](./LICENSE) for details.
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