leetcode

0 /**

1 * @param {number[]} arr

2 * @param {Function} fn

3 * @return {number[]}

4 */

5

6 var filter = function(arr, fn) {

7 var j = 0;

8 for(let i = 0; i < arr.length; i++)

9 if(fn(arr[i], i)) arr[j++] = arr[i];

10 while (arr.length > j) arr.pop();

11 return arr;

12 };