30 seconds of code

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Removes elements in an array until the passed function returns true. Returns the removed elements.

Loop through the array, using a for...of loop over Array.prototype.entries() until the returned value from the function is true. Return the removed elements, using Array.prototype.slice().

const takeWhile = (arr, func) => {
  for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);
  return arr;