191. Number of 1 Bits

https://leetcode.com/problems/number-of-1-bits/

Python

Convert the type and count

class Solution:
    def hammingWeight(self, n: int) -> int:
        bins = str(bin(n))[2:]
        return sum([int(char) for char in bins])

Hamming Weight

class Solution:
    def hammingWeight(self, n: int) -> int:
        total = 0
        while n:
            total += 1
            n &= (n-1)
        return total

Javascript

var hammingWeight = function(n) {
  let count = 0;
  while (n > 0) {
    count += (n & 1);
    n >>>= 1;
  }
  return count;
};