ES6 object dies

Question

I'm checking new ES6 cool things, and now I am learning new classes definitions.

All is clear, class, extends, constructor, etc.

Example:

class AnimalES6 {
    constructor(name) {
        this._name = name;
    }

    get name() {
        return this._name;
    }
}

var animal = new AnimalES6('Tiger');

console.log(animal.name); // Tiger

But what about destruct?

Can I call some function, when object dies, like in PHP/JAVA?

animal = null; // "Now" (but not in this moment =) ) destruct() method must be called