21 lines
611 B
Markdown
21 lines
611 B
Markdown
---
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title: dropRightWhile
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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 remaining elements in the array.
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Loop through the array, using `Array.prototype.slice()` to drop the last element of the array until the returned value from the function is `true`.
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Returns the remaining elements.
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```js
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const dropRightWhile = (arr, func) => {
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let rightIndex = arr.length;
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while (rightIndex-- && !func(arr[rightIndex]));
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return arr.slice(0, rightIndex + 1);
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};
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```
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```js
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dropRightWhile([1, 2, 3, 4], n => n < 3); // [1, 2]
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``` |