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takeRightWhile javascript Code Snippet in 2023

arrayintermediate

Last Updated: 28 January 2023

Removes elements from the end of an array until the passed function returns false. Returns the removed elements.

  • Create a reversed copy of the array, using the spread operator (...) and Array.prototype.reverse().
  • Loop through the reversed copy, using a for...of loop over Array.prototype.entries() until the returned value from the function is falsy.
  • Return the removed elements, using Array.prototype.slice().
  • The callback function, fn, accepts a single argument which is the value of the element.
const takeRightWhile = (arr, fn) => { for (const [i, val] of [...arr].reverse().entries()) if (!fn(val)) return i === 0 ? [] : arr.slice(-i); return arr; };
takeRightWhile([1, 2, 3, 4], n => n >= 3); // [3, 4]

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