8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
515 B
515 B
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().
const takeWhile = (arr, func) => {
for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);
return arr;
};
takeWhile([1, 2, 3, 4], n => n >= 3); // [1, 2]