2634. Filter Elements from Array

Given an integer array arr and a filtering function fn, return a filtered array filteredArr.
The fn function takes one or two arguments:

arr[i] - number from the arr
i - index of arr[i]

filteredArr should only contain the elements from the arr for which the expression fn(arr[i], i) evaluates to a truthy value. A truthy value is a value where Boolean(value) returns true.
Please solve it without the built-in Array.filter method.

/**
 * @param {number[]} arr
 * @param {Function} fn
 * @return {number[]}
 */
var filter = function(arr, fn) {
    // your code...
};

Решение

var filter = function(arr, fn) {
    let resultArr = [];
    for (var i = 0; i < arr.length; i++){
        if (fn(arr[i], i)){
            resultArr.push(arr[i]);
        }
    }
    return resultArr;
};