30秒学会 JavaScript 片段 – takeWhile

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().

代码片段

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

使用样例

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