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

	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)

	Example: (Input1, Input2 -->Output)
				

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

Solution by -

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

Try it yourself - CodeWars

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

	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)

	Example: (Input1, Input2 -->Output)
				

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

Solution by -

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

Try it yourself - CodeWars