[Codewars] Sum The Strings (8 kyu) / JavaScript

https://www.codewars.com/kata/5966e33c4e686b508700002d

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DESCRIPTION:

Create a function that takes 2 integers in form of a string as an input, and outputs the sum (also as a string):

Example: (Input1, Input2 -->Output)

"4",  "5" --> "9"
"34", "5" --> "39"
"", "" --> "0"
"2", "" --> "2"
"-5", "3" --> "-2"

Notes:

• If either input is an empty string, consider it as zero.
• Inputs and the expected output will never exceed the signed 32-bit integer limit (2^31 - 1)

 

코드

function sumStr(a,b) {
  return String(Number(a) + Number(b));
}