Source code for

from typing import Callable, TypeVar

from returns.interfaces.mappable import MappableN
from import Kinded, KindN, kinded

_FirstType = TypeVar('_FirstType')
_SecondType = TypeVar('_SecondType')
_ThirdType = TypeVar('_ThirdType')
_UpdatedType = TypeVar('_UpdatedType')

_MappableKind = TypeVar('_MappableKind', bound=MappableN)

[docs]def map_( function: Callable[[_FirstType], _UpdatedType], ) -> Kinded[Callable[ [KindN[_MappableKind, _FirstType, _SecondType, _ThirdType]], KindN[_MappableKind, _UpdatedType, _SecondType, _ThirdType], ]]: """ Lifts function to be wrapped in a container for better composition. In other words, it modifies the function's signature from: ``a -> b`` to: ``Container[a] -> Container[b]`` This is how it should be used: .. code:: python >>> from import IO >>> from returns.pointfree import map_ >>> def example(argument: int) -> float: ... return argument / 2 >>> assert map_(example)(IO(1)) == IO(0.5) Note, that this function works for all containers with ``.map`` method. See :class:`returns.primitives.interfaces.mappable.MappableN` for more info. See also: - """ @kinded def factory( container: KindN[_MappableKind, _FirstType, _SecondType, _ThirdType], ) -> KindN[_MappableKind, _UpdatedType, _SecondType, _ThirdType]: return return factory