How to add two strings as if they were numbers? [duplicate]

Answer 1

You may use like this:

var num1 = '20',
    num2 = '30.5';

alert((num1*1) + (num2*1)); //result 50.5

When apply *1 in num1, convert string a number.

if num1 contains a letter or a comma, returns NaN multiplying by 1

if num1 is null, num1 returns 0

kind regards!!!