Method bind

returns/future.py:782–817

Applies 'function' to the result of a previous calculation. 'function' should accept a single "normal" (non-container) argument and return ``Future`` type object. .. code:: python >>> import anyio >>> from returns.future import FutureResult

(
        self,
        function: Callable[
            [_ValueType_co],
            Kind2['FutureResult', _NewValueType, _ErrorType_co],
        ],
    )

        )

    def bind(
        self,
        function: Callable[
            [_ValueType_co],
            Kind2['FutureResult', _NewValueType, _ErrorType_co],
        ],
    ) -> 'FutureResult[_NewValueType, _ErrorType_co]':
        """
        Applies 'function' to the result of a previous calculation.

        'function' should accept a single "normal" (non-container) argument
        and return ``Future`` type object.

        .. code:: python

          >>> import anyio
          >>> from returns.future import FutureResult
          >>> from returns.io import IOSuccess, IOFailure

          >>> def bindable(x: int) -> FutureResult[int, str]:
          ...    return FutureResult.from_value(x + 1)

          >>> assert anyio.run(
          ...     FutureResult.from_value(1).bind(bindable).awaitable,
          ... ) == IOSuccess(2)
          >>> assert anyio.run(
          ...     FutureResult.from_failure(1).bind(bindable).awaitable,
          ... ) == IOFailure(1)

        """
        return FutureResult(
            _future_result.async_bind(
                function,
                self._inner_value,
            )
        )

    #: Alias for `bind` method.
    #: Part of the `FutureResultBasedN` interface.