In functional programming, a monad transformer is a type constructor which takes a monad as an argument and returns a monad as a result. Monad transformers can be used to compose features encapsulated by monads – such as state, exception handling, and I/O – in a modular way.
In functional programming, a monad transformer is a type constructor which takes a monad as an argument and returns a monad as a result. Monad transformers can be used to compose features encapsulated by monads – such as state, exception handling, and I/O – in a modular way.
Source: Wikipedia "Monad transformer" · CC BY-SA 4.0
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