The first "data-first" and "data-last" utility library designed especially for TypeScript.

Read the full docs and API reference on remedajs.com/docs.

Migrating from other libraries? Check out our migration guides for Lodash and Ramda!

Interested in contributing? Read the contributing guide.

• First-class TypeScript support, with types that are as specific as possible.
• Supports data-first (R.filter(array, fn)) and data-last (R.filter(fn)(array)) approaches.
• Lazy evaluation support with pipe and piped.
• Runtime and types are both extensively tested, with full code coverage.
• Tree-shakable, supports CJS and ESM.
• Fully documented with JSDoc, supports in-editor function documentation.

npm install remeda
pnpm add remeda
yarn add remeda
bun install remeda

// Import everything:
import * as R from "remeda";

// Or import methods individually:
// import { pipe, tap, unique, take } from "remeda";

R.pipe(
  [1, 2, 2, 3, 3, 4, 5, 6],
  R.tap((value) => console.log(`Got ${value}`)),
  R.unique(),
  R.take(3),
); // => [1, 2, 3]

// Console output:
// Got 1
// Got 2
// Got 2
// Got 3

Questions, bug reports, and feature requests are tracked in GitHub issues.