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// Source : https://leetcode.com/problems/add-strings/

// Author : Han Zichi

// Date : 2016-10-09

// "use strict";

/**

* @param {string} num1

* @param {string} num2

* @return {string}

var addStrings = function(num1, num2) {

let [i, j] = [num1.length, num2.length];

let ans = '';

let add = 0;

i -= 1, j -= 1;

for ( ; i >= 0 || j >= 0; i--, j--) {

let a = i >= 0 ? +num1[i] : 0;

let b = j >= 0 ? +num2[j] : 0;

let sum = a + b + add;

ans = sum % 10 + ans;

add = ~~(sum / 10);

}

add && (ans = add + ans);

return ans;

};