ES6 SetAll Map Override

ES6-set-all-map

class MyMap extends Map {
  constructor() {
    super();
    this.counter = 0;
    this.all_value = null;
  }

  set(key, value) {
    if (value) {
      super.set(key, { ts: this.counter++, v: value });
    } else {
      super.set(key, null);
    }
  }

  setAll(value) {
    this.all_value = { ts: this.counter++, v: value };
  }

  get(key) {
    let val;
    if (
      super.get(key) &&
      this.all_value &&
      this.all_value.ts >= super.get(key).ts
    ) {
      val = this.all_value;
    } else {
      val = super.get(key);
    }
    val = val ? val.v : undefined;
    console.log(val);
    return val;
  }
}

let map = new MyMap();

console.log("start");

map.set("a", 1);
map.set("b", 2);
map.setAll(-1);
map.set("c", 3);
map.set("b", 4);

map.get("a");
map.get("b");
map.get("c");
map.get("d");

console.log("end");