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.

Solve it without the built-in Array.filter method.

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

const arr = [1, 2, 3];
const fn = (n, i) => {
    return i === 0;
}
const result = filter(arr, fn);
console.log(result);