Method map

packages/db-ivm/src/multiset.ts:36–40

* Apply a function to all records in the collection.

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

   * Apply a function to all records in the collection.
   */
  map<U>(f: (data: T) => U): MultiSet<U> {
    return new MultiSet(
      this.#inner.map(([data, multiplicity]) => [f(data), multiplicity]),
    )
  }

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