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

Example , you can use this:

var numberOne:number = +document.querySelector(".first").value;
var numberTwo:number = +document.querySelector(".second").value;
var sum = numberOne + numberTwo;

You should use + Angular typeScript