addStrings.js

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

  sumStr("4", "5")    // should output "9"
  sumStr("34", "5")   // should output "39"
If either input is an empty string, consider it as zero.
*/

//Answer//

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