21 lines
651 B
Markdown
21 lines
651 B
Markdown
---
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title: mapConsecutive
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tags: array,intermediate
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firstSeen: 2021-08-08T05:00:00-04:00
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---
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Maps each block of `n` consencutive elements using the given function, `fn`.
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- Use `Array.prototype.slice()` to get `arr` with `n` elements removed from the left.
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- Use `Array.prototype.map()` and `Array.prototype.slice()` to apply `fn` to each block of `n` consecutive elements in `arr`.
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```js
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const mapConsecutive = (arr, n, fn) =>
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arr.slice(n - 1).map((v, i) => fn(arr.slice(i, i + n)));
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```
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```js
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mapConsecutive([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 3, x => x.join('-'));
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// ['1-2-3', '2-3-4', '3-4-5', '4-5-6', '5-6-7', '6-7-8', '7-8-9', '8-9-10'];
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```
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