Pseudo-classical OOP pattern

function Animal(name) {
    this.name = name;
    this.canWalk = true;
}

Animal.prototype.sit = function() {

        this.canWalk = false;
        alert(this.name + ' sits down.');
    };


var animal = new Animal('Pet');
console.log(animal.canWalk);
animal.sit();
console.log(animal.canWalk);