dropWhile

Removes elements in 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 first element of the array until the value returned from func is true.
• Return the remaining elements.

const dropWhile = (arr, func) => {
  while (arr.length > 0 && !func(arr[0])) arr = arr.slice(1);
  return arr;
};

dropWhile([1, 2, 3, 4], n => n >= 3); // [3, 4]