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dropRightWhile javascript Code Snippet in 2024

arrayintermediate

Last Updated: 19 September 2024

Removes elements from the end of an array until the passed function returns true. Returns the remaining elements in the array.

  • Loop through the array, using Array.prototype.slice() to drop the last element of the array until the value returned from func is true.
  • Return the remaining elements.
const dropRightWhile = (arr, func) => { let rightIndex = arr.length; while (rightIndex-- && !func(arr[rightIndex])); return arr.slice(0, rightIndex + 1); };
dropRightWhile([1, 2, 3, 4], n => n < 3); // [1, 2]

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