/**
 * @param {number} n - a positive integer
 * @return {number}
 */
var hammingWeightOld = function(n) {
    let res = 0
    for (let i = 0; i < 32; i++, res += n & 1, n >>= 1) {}
    return res
};

// simple solution using build-in
var hammingWeight = function(n) {
    return (n).toString(2).replace(/0/g, '').length;
};

function __main__() {
    console.log(hammingWeight(0xFFFFFFFF))
    console.log(hammingWeightOld(0xFFFFFFFF))
}

__main__()