JavaScript
CHALLENGE
class Counter {
static #total = 0;
#id;
constructor() {
Counter.#total++;
this.#id = Counter.#total;
}
get id() { return this.#id; }
static get total() { return Counter.#total; }
}
class Special extends Counter {
#label;
constructor(label) {
super();
this.#label = label;
}
get label() { return `${this.#label}-${this.id}`; }
}
const c1 = new Counter();
const c2 = new Special('x');
const c3 = new Special('y');
console.log(c1.id, c2.id, c3.label, Counter.total);
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