Adding two Variables together?

Question

Trying to add two integer variables together, however, I can't seem to figure it out as it just joins them as strings?

var age_child = 10;
var age_gap = 10
alert(age_child+age_gap);

Result: 1010, Want Result: 20

Answer 1

var age_child = parseInt(10);
var age_gap = parseInt(10);

alert(age_child+age_gap); // should now alert 20

To clarify, in this exact example it is not required to do parseInt. However, I assumed you didn't exactly have 10 in your code either and they're instead variables.

Answer 2

use parseInt(age_child) + parseInt(age_gap);