How do I subtract a percentage from a number in a string?

Question

var valueInString = "2383";

How do I subtract 35% from number and put it back in the variable?

valueInString = valueInString - 35% 

Something like the above?

Answer 1

If I understand you correctly, you want to subtract 35% of valueInString from valueInString. So it is just some basic math.

var valueInString = "2383";
var num = parseFloat(valueInString);
var val = num - (num * .35);
console.log(val);

Answer 2

Math:

valueInString = valueInString * (1 - 0.35);

Shorter:

valueInString *= 1 - 0.35;