Function flatten

returns/converters.py:18–49

Joins two nested containers together. Please, note that it will not join two ``Failure`` for ``Result`` case or two ``Nothing`` for ``Maybe`` case (or basically any two error types) together. .. code:: python >>> from returns.converters import flatten >>> from

(
    container: KindN[
        _BindableKind,
        KindN[_BindableKind, _FirstType, _SecondType, _ThirdType],
        _SecondType,
        _ThirdType,
    ],
)

@kinded
def flatten(
    container: KindN[
        _BindableKind,
        KindN[_BindableKind, _FirstType, _SecondType, _ThirdType],
        _SecondType,
        _ThirdType,
    ],
) -> KindN[_BindableKind, _FirstType, _SecondType, _ThirdType]:
    """
    Joins two nested containers together.

    Please, note that it will not join
    two ``Failure`` for ``Result`` case
    or two ``Nothing`` for ``Maybe`` case
    (or basically any two error types) together.

    .. code:: python

      >>> from returns.converters import flatten
      >>> from returns.io import IO
      >>> from returns.result import Failure, Success

      >>> assert flatten(IO(IO(1))) == IO(1)

      >>> assert flatten(Success(Success(1))) == Success(1)
      >>> assert flatten(Failure(Failure(1))) == Failure(Failure(1))

    See also:
        - https://bit.ly/2sIviUr

    """
    return container.bind(identity)


def result_to_maybe(