2025-08-20 20:38:27 +0300 MSK

/**
 * @param {number[]} arr
 * @param {Function} fn
 * @return {number[]}
 */
var filter = function(arr, fn) {
    let res = [];
    for (const [i, val] of arr.entries()) {
        if (fn(val, i)) {
            res.push(val);
        }
    }
    return res;
};