Multiply Function

gistfile1.js

var multiply = function() {
    var _args = [].slice.call(arguments);
    var length = _args.length;
    
    if (Array.isArray(this)) {  
        this.push(_args.pop());
        
        if (this.length === 3) {
            return (this[0] * this[1] * this[2]);
        }
        
        return multiply.bind(this);
    }
    
    return multiply.bind(_args);
};

var multiply = function() {
var _args = [].slice.call(arguments);
if (_args.length === 3) {
return _args[0] * _args[1] * _args[2];
} else {
return function() {
_args.push([].slice.call(arguments).pop());
return multiply.apply(this, _args);
};
}
};

This would be a simpler solution.