# Flip the arguments of a function

Call a function with its arguments in reverse order.

Canonical: https://1loc.dev/function/flip-the-arguments-of-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 flip(fn) { return (...args) => fn(...args.reverse()); }
```

## Usage

```javascript
const divide = (a, b) => a / b;
flip(divide)(2, 10); // → 5
const isMember = (list, item) => list.includes(item);
flip(isMember)('ana', ['ana', 'rui']); // → true
```

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

- All arguments are reversed. For two arguments, (b, a) => fn(a, b) is the explicit form.

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/flip-the-arguments-of-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.