Method keys

data_structures/unstable_multimap.ts:560–565

* Returns an iterator of all distinct keys in the map, in insertion order. * * Mutating the map during iteration is not supported and may skip or repeat * keys. * * @experimental **UNSTABLE**: New API, yet to be vetted. * * @returns An iterator of keys. * * @example Usage

()

   * ```
   */
  keys(): IterableIterator<K> {
    // Delegates to the underlying `Map.prototype.keys()` (a native
    // `MapIterator`); no per-bucket work is needed, so wrapping it in a
    // hand-rolled iterator would be pure overhead.
    return this.#map.keys();
  }

  /**
   * Returns an iterator of all individual values across all keys, in insertion