phaser/src/math/Factorial.js

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/**
* @author Richard Davey <rich@photonstorm.com>
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* @copyright 2019 Photon Storm Ltd.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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/**
* Calculates the factorial of a given number for integer values greater than 0.
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*
* @function Phaser.Math.Factorial
* @since 3.0.0
*
* @param {number} value - A positive integer to calculate the factorial of.
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*
* @return {number} The factorial of the given number.
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*/
var Factorial = function (value)
{
if (value === 0)
{
return 1;
}
var res = value;
while (--value)
{
res *= value;
}
return res;
};
module.exports = Factorial;