---
title: Binary function arity
type: snippet
tags: [function]
author: chalarangelo
cover: blue-bird
dateModified: 2020-10-18T23:04:45+03:00
---

Creates a function that accepts up to two arguments, ignoring any additional arguments.

- Call the provided function, `fn`, with the first two arguments given.

```js
const binary = fn => (a, b) => fn(a, b);
```

```js
['2', '1', '0'].map(binary(Math.max)); // [2, 1, 2]
```