Dictionary (Map/WeakMap) - https://www.typescriptlang.org/play/?#code/MYGwhgzhAEAiCWwAu8D2A7MAnAngHgBUA+aAbwChpp4kBTAWwgC4zoBtAa1pxYiS3joA5gF0WBaAF8A3OUrRgGPlgCuyVFgAU6WgHcAknUYsASrUVYAJnmWChAGmjEAlGXlUkAC3gQAdDQYYAF5oHQMjCFkqSTkqCFokQwZNLh5oW2FHADcwEBVacVcKKg9vPwDGTm4RaBCcvNooqVjoT0gU7l5+OyL3aCwElSx0aFTqEa8ffwimmPkB+lQs2g60jKFnFgAjVFQQWjAR4pL4A…

dictionary.ts

// Similar to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
class Dictionary<T> {
  items: { [key: string]: T };

  constructor(newItems: Record<string, T>) {
    this.items = newItems;
  }

  setItem(key: string, value: T) {
    this.items[key] = value;
  }

  has(key: string) {
    return key in this.items;
  }

  remove(key: string): boolean {
    if (this.has(key)) {
      delete this.items[key];
      return true;
    }
    return false;
  }

  getItem(key: string): T | undefined {
    return this.has(key) ? this.items[key] : undefined;
  }

  clear() {
    this.items = {};
  }

  size(): number {
    return Object.keys(this.items).length;
  }

  keys() {
    let keys = [];

    for (const k in this.items) {
      if (this.has(k)) {
        keys.push(k);
      }
    }
    return keys;
  }

  values() {
    let values = [];

    for (const k in this.items) {
      if (this.has(k)) {
        values.push(this.items[k]);
      }
    }
    return values;
  }

  getItems(): Record<string, T> {
    return this.items;
  }
}

interface Person {
  age: number;
}

const dict = new Dictionary<Person>({
  helder: {
    age: 31,
  },
});

dict.setItem("paula", {
  age: 37,
});
console.log(dict.keys());
console.log(dict.values());