Detecting float numbers in Javascript

Hello! I'm doing a Javascript homework at the moment and I need some help: I would like to know if some number is a floating point number.

Actually, I have a solution, albeit not very elegant: regular expressions for detecting dots/commas...
I've thought that there may be a better way to do it as I don't really want to resort to reg exp since they are especially ugly.

(will use them as a backup solution though)

Got any idea?

Thank you

I don't do Javascript, but I'm assuming it only has generic variables right? The question is, how do I determine if X is an integer or not?

Or do you have a string and want to know if it is a character representation of an integer or not?

I want to know if a number is a float because I want to know if the input is an integer.
I have a string and I want to know if it is a float or a integer. Problem is, javascript doesn't have a different type for those two: both are numbers.

typeof(1) = "number"
typeof(1.24) = "number"

Yea, thought so. I guess the only thing to do is check if the string has a period (or comma) in it somewhere:

var str = "123.3";
var i = str.indexOf('.');

// i is 3

var str = "123";
var i = str.indexOf('.');

// i is -1

I'm guessing you could also do something like:

if (parseFloat(var) == parseInt(var)) // was integer

Finally, did it with regexp:

var regexp_floatcheck = /\./;

if (regexp_floatcheck.test(document.getElementById("case1").value) == true)
    {
           alert("You need to enter an integer in here!")               
    }
else
    {
        blablabla
    }

ugly, but couldn't find anything simpler.

indexOf not work?

if (document.getElementById("case1").value.indexOf('.') != -1)
    {
           alert("You need to enter an integer in here!")               
    }
else
    {
        blablabla
    }

ITT:  Shit I'm glad I don't have to ever understand.

You should see Brainfuck. I want to know that language so I can get all the ladies (like I don't already). This is how you print "Hello World!":

++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

Quote:
Nerddd <3