20 lines
535 B
Markdown
20 lines
535 B
Markdown
---
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title: ary
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tags: function,advanced
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firstSeen: 2018-01-24T13:59:54+02:00
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lastUpdated: 2020-10-18T20:24:28+03:00
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---
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Creates a function that accepts up to `n` arguments, ignoring any additional arguments.
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- Call the provided function, `fn`, with up to `n` arguments, using `Array.prototype.slice(0, n)` and the spread operator (`...`).
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```js
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const ary = (fn, n) => (...args) => fn(...args.slice(0, n));
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```
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```js
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const firstTwoMax = ary(Math.max, 2);
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[[2, 6, 'a'], [6, 4, 8], [10]].map(x => firstTwoMax(...x)); // [6, 6, 10]
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```
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