ES5 is verbose

verbose.js

var Animal = {
    legs: 4,
    walk: function () { ... }
};

var Cat = Object.create(Animal, {
    nyan: {
        value: function () { ... },
        configurable: true
    },
    constructor: {
        value: function () { this.lives = 9; },
        configurable: true
    }
});

var cat = Object.create(Cat);
cat.constructor();