// Combiner of passed arguments and defaults (usable with any function) Object.prototype.combine = function(_args)( for(var i in this) ( if(typeof _args(i) == "undefined") ( _args(i) = this(i); ) ) ); // Specific example function with defaults function feedTheCat(args)( var defaults = ( 'morning' : "nothing", 'noon' : "pork", 'nite' : "mouse" ); defaults.combine(args); ) // USAGE: only passing 2 of 3 arguments feedTheCat(( 'morning': "milk", 'nite': "kitekat" )); // Values would be: milk | pork | kitekat