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You’re currently reading “Logical XOR in JavaScript,” an entry on Web 3.0, 6 Bladed Razors, 7 Minute Abs

Published:
03.23.07 / 9pm
Category:
JavaScript
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Logical XOR in JavaScript

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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