Method pick

packages/effect/src/Optic.ts:732–732

* Focuses on a subset of keys of the current struct focus. * * **Details** * * - On a Lens, returns a Lens. * - On an Optional, returns an Optional. * - Does **not** work on union types (compile error). * * **Example** (Picking keys) * * ```ts import.met

(
    this: Lens<S, A>,
    keys: Keys,
    ..._err: ForbidUnion<A, "cannot use `pick` on a union type">
  )

   * @see `.omit()` — the inverse operation
   */
  pick<S, A, Keys extends ReadonlyArray<keyof A>>(
    this: Lens<S, A>,
    keys: Keys,
    ..._err: ForbidUnion<A, "cannot use `pick` on a union type">