Method hasEntry

data_structures/unstable_multimap.ts:257–262

* Returns `true` if the `[key, value]` entry exists in the map (i.e. the * given value appears at least once under the given key). * * @experimental **UNSTABLE**: New API, yet to be vetted. * * @param key The key to look up. * @param value The value to check. * @returns `true` i

(key: K, value: V)

   * ```
   */
  hasEntry(key: K, value: V): boolean {
    // `Array.prototype.includes` uses SameValueZero, which matches the
    // hand-rolled loop in `deleteEntry()` (and the `Map`/`Set` contract) so
    // `NaN` and `±0` behave consistently across the two methods.
    return this.#map.get(key)?.includes(value) ?? false;
  }

  /**
   * Removes all values for the given key.