jquery find if variable is divisible by 2

Question

How do I figure out if a variable is divisible by 2? Furthermore I need do a function if it is and do a different function if it is not.

Answer 1

Use modulus:

// Will evaluate to true if the variable is divisible by 2
variable % 2 === 0  

Answer 2

You don't need jQuery. Just use JavaScript's Modulo operator.

Answer 3

You can use the modulus operator like this, no need for jQuery. Just replace the alerts with your code.

var x = 2;
if (x % 2 == 0)
{
  alert('even');
}
else
{
  alert('odd')
}

Answer 4

var x = 2;
x % 2 ? oddFunction() : evenFunction();

Answer 5

You can also:

if (x & 1)
 itsOdd();
else
 itsEven();

Answer 6

Seriously, there's no jQuery plugin for odd/even checks?

Well, not anymore - releasing "Oven" a jQuery plugin under the MIT license to test if a given number is Odd/eVEN.

Source code is also available at http://jsfiddle.net/HRBPX/

Test-suites are available at http://jsfiddle.net/2XjBk/

(function() {
    /*
     * isEven(n)
     * @args number n
     * @return boolean returns whether the given number is even
     */
    jQuery.isEven = function(number) {
        return number % 2 == 0;
    };

    /* isOdd(n)
     * @args number n
     * @return boolean returns whether the given number is odd
     */
    jQuery.isOdd = function(number) {
        return !jQuery.isEven(number);
    };
})();​