Function isLeft

  • isLeft<E, A>(
        either: Either<E, A>,
    ): either is Readonly<{ isRight: false; left: E }>

  • Type guard that checks if an either is Left<E>.

    Type Parameters

    • E
    • A

    Parameters

    • either: Either<E, A>

      The Either to check

    Returns either is Readonly<{ isRight: false; left: E }>

    true if the Either is Left<E>, false if it is Right<A>

Settings

Member Visibility