Function predicate

packages/effect/test/Option.test.ts:394–394

(a: number)

  it("exists", () => {
    const predicate = (a: number) => a === 2
    assertFalse(pipe(Option.none(), Option.exists(predicate)))
    assertFalse(pipe(Option.some(1), Option.exists(predicate)))
    assertTrue(pipe(Option.some(2), Option.exists(predicate)))