How do I use a static variable in ES6 class?

Question

I\'m trying to use a static variable in es6. I\'d like to declare a static variable count in Animal class and increase it. However, I couldn\'t declare

Answer 1

To set a static variable, set it on the object Animal itself. As of now in Javascript you cannot directly declare static properties inside classes like you can declare static methods.

class Animal {
    constructor() {
    }

    static increaseCount() {
        this.count += 1;
    }

    static getCount() {
        return this.count;
    }
}
Animal.count = 0;
console.log(Animal.increaseCount());
console.log(Animal.getCount());