Logical XOR in JavaScript

By Zach Leatherman | Published: March 23, 2007

Of course there wouldn’t be an XOR function in JavaScript when I needed one. So I googled around and found an implementation at How To Create. But it only took two arguments. So I rolled my own supporting a variable number of arguments. In my personal stuff, I’ve put it into a Math library under the YAHOO namespace, and you can decide if you want to do that on your own.

function xor()
{
	var b = false;
	for( var j = 0; j < arguments.length; j++ )
	{
		if( arguments[ j ] && !b ) b = true;
		else if( arguments[ j ] && b ) return false;
	}
	return b;
};

Usage:

xor( false, true ); // true
xor( true, true ); // false
xor( false, false, true, true, true, false, true, false ); // false
xor( false, false, false, true, false, false, false, false ); // true
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