Find if variable is divisible by 2
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.
Use modulus:
// Will evaluate to true if the variable is divisible by 2
variable % 2 === 0
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/7HQNG/
Test-suites are available at http://jsfiddle.net/zeuRV/
(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);
};
})();
You don't need jQuery. Just use JavaScript's Modulo operator.
You can do it in a better way (up to 50 % faster than modulo operator):
odd: x & 1 even: !(x & 1)
Reference: High Performance JavaScript, 8. ->Bitwise Operators
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')
}