Inheritance in javascript

inheritance.js

// Practices from Object Oriented Javascript
// version 0.0.0.11
(function() {
    function multi() {
        var n = {},
            stuff, j = 0,
            len = arguments.length;
        for (j = 0; j < len; j++) {
            stuff = arguments[j];
            for (var i in stuff) {
                n[i] = stuff[i];
            }
        }
        return n;
    }

    var shape = {
        name: 'Shape',
        toString: function() {
            return this.name;
        }
    };

    var twoDee = {
        name: '2D Shape',
        dimensions: 2
    };

    var triangle = multi(shape, twoDee, {
        name: 'Triangle',
        getArea: function() {
            return this.side * this.height / 2;
        },
        side: 5,
        height: 10
    });

    //test
    console.info(triangle.getArea()); //->25
    console.info(triangle.dimensions); //->2
    console.info(triangle.toString()); //->Triangle
})();