Method deleteEntry

data_structures/unstable_multimap.ts:317–336

* Removes the first occurrence of the `[key, value]` entry from the map. * If the key's list becomes empty, the key is also removed. * * @experimental **UNSTABLE**: New API, yet to be vetted. * * @param key The key to look up. * @param value The value to remove. * @returns `true

(key: K, value: V)

   * ```
   */
  deleteEntry(key: K, value: V): boolean {
    const list = this.#map.get(key);
    if (!list) return false;
    // SameValueZero, matching `hasEntry()` / `Map` / `Set` semantics so that
    // `NaN` values can be removed. `Array.prototype.indexOf` uses strict
    // equality and would never match `NaN`.
    let index = -1;
    for (let i = 0; i < list.length; i++) {
      const v = list[i]!;
      if (v === value || (v !== v && value !== value)) {
        index = i;
        break;
      }
    }
    if (index === -1) return false;
    list.splice(index, 1);
    this.#valueCount--;
    if (list.length === 0) this.#map.delete(key);
    return true;
  }

  /**
   * Removes all entries.