21 lines
463 B
Markdown
21 lines
463 B
Markdown
---
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title: Unary function arity
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tags: function
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expertise: beginner
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cover: blog_images/flower-portrait-2.jpg
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firstSeen: 2018-01-24T13:22:32+02:00
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lastUpdated: 2020-10-22T20:24:44+03:00
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---
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Creates a function that accepts up to one argument, ignoring any additional arguments.
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- Call the provided function, `fn`, with just the first argument supplied.
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```js
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const unary = fn => val => fn(val);
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```
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```js
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['6', '8', '10'].map(unary(parseInt)); // [6, 8, 10]
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```
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