mirror of
https://github.com/photonstorm/phaser
synced 2024-12-23 19:43:28 +00:00
34 lines
695 B
JavaScript
34 lines
695 B
JavaScript
/**
|
|
* @author Richard Davey <rich@photonstorm.com>
|
|
* @copyright 2019 Photon Storm Ltd.
|
|
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
|
|
*/
|
|
|
|
/**
|
|
* Calculates the factorial of a given number for integer values greater than 0.
|
|
*
|
|
* @function Phaser.Math.Factorial
|
|
* @since 3.0.0
|
|
*
|
|
* @param {number} value - A positive integer to calculate the factorial of.
|
|
*
|
|
* @return {number} The factorial of the given number.
|
|
*/
|
|
var Factorial = function (value)
|
|
{
|
|
if (value === 0)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
var res = value;
|
|
|
|
while (--value)
|
|
{
|
|
res *= value;
|
|
}
|
|
|
|
return res;
|
|
};
|
|
|
|
module.exports = Factorial;
|