1342. Number of Steps to Reduce a Number to Zero.js

/**
 * @param {number} num
 * @return {number}
 */
var numberOfSteps = function(num) {
    var a = 0;
    while(num > 0){
        if(num % 2 == 0) num /= 2;
        else num -= 1;
        a++;
    }
    return a;
};