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HC20-20. Haskell Chapter 20 Practical Tasks: Monad |
A Monad in Haskell is an abstraction that extends Functors and Applicative Functors, providing a structured way to handle computations with context and effects. Monads enable sequential composition, allowing functions that return wrapped values (e.g., Maybe a, IO a, Either e a) to be chained together seamlessly.
? Key Features
Bind (>>=) - Chains computations while preserving context.
return - Lifts a value into a monadic context.
Monad Laws - Ensure consistent and predictable behavior.
Common Monads - Examples include:
Maybe (for optional values)
IO (for side effects)
Either (for error handling)
[] (list, for nondeterminism)
and more.
Monads help manage side effects, handle errors, and structure computations cleanly, making them one of Haskell's most powerful and widely used abstractions. |
