# Uncurry a function

Call a curried function with several arguments at once.

Canonical: https://1loc.dev/function/uncurry-a-function/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Usage lines executed in Node.js 22 and headless Chromium; no external services
Updated: 2026-10-28

## Implementation

```javascript
function uncurry(fn, depth = 1) { return (...args) => args.slice(0, depth).reduce((next, arg) => next(arg), fn); }
```

## Usage

```javascript
const sum = a => b => c => a + b + c;
uncurry(sum, 1)(1)(2)(3); // → 6
uncurry(sum, 2)(1, 2)(3); // → 6
uncurry(sum, 3)(1, 2, 3); // → 6
```

Lines marked → were executed in Node.js 22 and in headless Chromium, and each result was compared with the value shown. Lines marked e.g. are illustrative.

## Limits

- Arguments beyond depth are ignored, as in the original. depth must not exceed the curried function’s depth.

The function does not validate its arguments. Add checks where it receives untrusted input.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/uncurry-a-function.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: See original repository history
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Documented as a reference with executed usage lines. Original MDX retained as inert source evidence.