Leetcode-JavaScript/Add Strings.js at master · parshva45/Leetcode-JavaScript · GitHub

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/*Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2.

Note:

The length of both num1 and num2 is < 5100.

Both num1 and num2 contains only digits 0-9.

Both num1 and num2 does not contain any leading zero.

You must not use any built-in BigInteger library or convert the inputs to integer directly.*/

/**

* @param {string} num1

* @param {string} num2

* @return {string}

var addStrings = function(num1, num2) {

b = num1.length >= num2.length ? num1 : num2

s = num1.length < num2.length ? num1 : num2

ans = ""

carry = 0

for(i=b.length-1, j=s.length-1; i>=0; i--, j--){

if(s[j] != null)

sum = Number(b[i]) + Number(s[j]) + carry

else

sum = Number(b[i]) + carry

ans = sum%10 + ans

carry = parseInt(sum/10)

}

if(carry == 1)

return carry + ans

return ans

};

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