Preparation code

<script>
var factorialRecursive = (function () {
	// 0! = 1 just 'cause
	var factorials = [ 1 ];

	return function fFactorial( n ) {
		if ( n < 0 ) {
			// negative n! not defined
			return null;
		} else if ( factorials[ n ] ) {
			return factorials[ n ];
		} else {
			factorials[ n ] = n * fFactorial( n - 1 );
			return factorials[ n ];
		}
	};
}());

var factorialIterative = (function () {
	// 0! = 1 just 'cause
	var factorials = [ 1 ];

	return function ( n ) {
		var j = factorials.length;

		if ( n < 0 ) {
			// negative n! not defined
			return null;
		} else {
			while( j <= n ) {
				factorials[ j ] = j * factorials[ j - 1 ];
				j += 1;
			}
			return factorials[ n ];
		}
	};
}());
</script>
    

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factorialRecursive(12);

factorialIterative(12);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

• Revision 1: published on 2013-5-14
• Revision 2: published on 2013-12-6
• Revision 3: published Ömer Kaşdarma on 2016-1-15

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