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17 lines
375 B
Python
17 lines
375 B
Python
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from __future__ import annotations
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from typing import Any, Callable, Generic, TypeVar
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from .monad import Monad
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T = TypeVar("T")
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S = TypeVar("S")
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F = Callable[[T], S]
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class Reader(Monad[T]):
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def __init__(self, function: F) -> None:
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self.function = function
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def map(self, function: F) -> Reader:
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return Reader(lambda x: function(self.function(x)))
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