How to compare two strings containing numbers in Javascript?

Question

For example , I would like to compare 0-91 and 0-93 , in the logic I'm using , 0-93 is bigger than the 0-91 because I'm only looking at the numbers after 0-, which are 91 and 93 . Basically I'm building a form where it checks for ranges of numbers but in the form , the numbers could be typed in for example as 91 and 93 , but they are usually typed in as 0-91 and 0-93 , how can I write the javascript logic so that the 0- is ignore while comparing the two numbers ?

Basically convert 0-91 and 0-93 into integers 91 and 93 , then compare them.

Answer 1

One way to do it would be :

var a = '0-91',
    b = '0-93',
    max = Math.max(a.slice(2), b.slice(2)), // for example
    max2 = Math.max(a.substr(-2), b.substr(-2)); // will work if a = "91" and b = "93"

Hope this helps

Answer 2

If you want support for:

• Range or no range ("0-93" or "93")
• More or less digits ("0-999" or "9")

This is one way to solve it:

function numberFromInput(value) {
  return Number(value.match(/[-]?(\d*)$/).pop());
}

Math.max(numberFromInput("91"), numberFromInput("0-93"));