Remove list elements while condition is met

JavaScript, Array · Nov 29, 2020

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

const takeWhile = (arr, fn) => {
  for (const [i, val] of arr.entries()) if (!fn(val)) return arr.slice(0, i);
  return arr;
};
takeWhile([1, 2, 3, 4], n => n < 3); // [1, 2]

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