es-toolkit

A modern JavaScript utility library that's 2-3 times faster and up to 97% smaller—a major upgrade to lodash.

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, delay, chunk, sum, and pick.
• Designed with performance in mind, es-toolkit achieves 2-3× better performance in modern JavaScript environments.
• es-toolkit supports tree shaking out of the box, and reduces JavaScript code by up to 97% 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.
• es-toolkit is battle-tested with 100% test coverage, ensuring reliability and robustness.

Features

Here are some of the features es-toolkit offers:

• Array: Utilities for array manipulation, such as uniq and difference.
• Function: Tools for controlling function execution, including debounce and throttle.
• Math: Numerical utilities like sum and round.
• Object: Tools for manipulating JavaScript objects, such as pick and omit.
• Predicate: Type guard functions like isNotNil.
• Promise: Asynchronous utilities like delay.
• String: Utilities for string manipulation, such as snakeCase

Examples

// 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]]

Resources

If you want to know more about the project, please take a look at the following resources:

• GitHub
• Documentation