javascript (+) sign concatenates instead of giving sum?

Question

I created a simple program that make the sum of two numbers BUT.. the program is concatenating instead, This is so confusing! Can anyone help?

Answer 1

Your numberOne and numberTwo are strings, so you get concatenated strings when use + sign with two string. Parse first to numbers then sum them. You can use parseInt() and parseFloat() functions for it.

var numberOne = '7';
var numberTwo = '8';

var sum = numberOne + numberTwo;
console.log(sum);

sum = parseFloat(numberOne) + parseFloat(numberTwo);
console.log(sum);