Can I do math in a photoshop script?

@mangurian 

Some references to common JS math methods:

https://www.w3schools.com/js/js_math.asp

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math

Two things to keep in mind:

1) Adobe ExtendScript does not support "modern" features

2) Digits entered into a prompt are returned as a string, not a number:

var input = prompt("enter a number", "2");
alert(input.toSource());

However, in practice, JS often deals with this gracefully:

var input = prompt("enter a number", "2");
var result = input * 2;
alert(result.toSource());

Hope this helps.