18 lines
493 B
Markdown
18 lines
493 B
Markdown
---
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title: takeRightWhile
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tags: array,function,intermediate
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---
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Removes elements from the end of an array until the passed function returns `true`. Returns the removed elements.
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- Loop through the array, using a `Array.prototype.reduceRight()` and accumulating elements while the function returns falsy value.
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```js
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const takeRightWhile = (arr, func) =>
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arr.reduceRight((acc, el) => (func(el) ? acc : [el, ...acc]), []);
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```
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```js
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takeRightWhile([1, 2, 3, 4], n => n < 3); // [3, 4]
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```
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