How can I check if a string is a float?

Question

I am passing in a parameter called value. I\'d like to know if value is a float. So far, I have the following:

if (!isNaN(value))
{
    alert(\'this is a num         


        

Answer 1

If you need to check if value is int or float:

function isFloatOrInt(n) {
    return !isNaN(n) && n.toString().match(/^-?\d*(\.\d+)?$/);
}