carbon/src/js/store/SubscribeMap.js

import { Subscribable } from "./Subscribable.js";
import { SubscribeValue } from "./SubscribeValue.js";

class SubscribeMap extends Subscribable {
  constructor() {
    super();
    Object.assign(this.events, {
      addItem: [],
      changeItem: [],
      removeItem: [],
    });
    this.map = new Map();
  }

  has(key) {
    return this.map.has(key) && this.map.get(key).exists();
  }

  get(key) {
    if (this.map.has(key)) {
      return this.map.get(key);
    } else {
      this.map.set(key, new SubscribeValue());
    }
  }

  set(key, value) {
    let s;
    if (this.map.has(key)) {
      s = this.map.get(key).set(value);
      this.broadcast("changeItem", key);
    } else {
      s = new SubscribeValue().set(value);
      this.map.set(key, s);
      this.broadcast("addItem", key);
    }
    return s;
  }
}

export { SubscribeMap };