#191 - Number of 1 Bits

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Problem Description

Write a function that takes an unsigned integer and returns the number of '1' bits it has (also known as the Hamming weight).

Solution

/**
 * @param {number} n - a positive integer
 * @return {number}
 */
var hammingWeight = function(n) {
  return n.toString(2).match(/1/g)?.length || 0;
};