21 lines
607 B
Markdown
21 lines
607 B
Markdown
---
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title: generateItems
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tags: array,function,intermediate
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firstSeen: 2020-10-09T20:41:21+03:00
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lastUpdated: 2020-10-22T20:23:47+03:00
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---
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Generates an array with the given amount of items, using the given function.
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- Use `Array.from()` to create an empty array of the specific length, calling `fn` with the index of each newly created element.
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- The callback takes one argument - the index of each element.
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```js
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const generateItems = (n, fn) => Array.from({ length: n }, (_, i) => fn(i));
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```
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```js
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generateItems(10, Math.random);
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// [0.21, 0.08, 0.40, 0.96, 0.96, 0.24, 0.19, 0.96, 0.42, 0.70]
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```
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