Method filter

packages/db-ivm/src/multiset.ts:45–47

* Filter out records for which a function f(record) evaluates to False.

(f: (data: T) => boolean)

   * Filter out records for which a function f(record) evaluates to False.
   */
  filter(f: (data: T) => boolean): MultiSet<T> {
    return new MultiSet(this.#inner.filter(([data, _]) => f(data)))
  }

  /**
   * Negate all multiplicities in the collection.