object_create.js

let animal = {
    init: function(name, age) {
        this.name = name;
        this.age  = age;
        return this;
    },
    getName: function() {
        return this.name;
    },
    getAge: function() {
        return this.age;
    }
}

let human = Object.create(animal).init('Ana', 24);
console.log(human.getAge());