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Real World Haskell by Bryan O'Sullivan, Don Stewart, and John Goerzen Chapter 18. Monad transformers Prev Next Table of Contents Motivation: boilerplate avoidance A simple monad transformer example Common patterns in monads and monad transformers Stacking multiple monad transformers Hiding our work Exercises Moving down the stack When explicit lifting is necessary Understanding monad transformers by building one Creating a monad transformer More typeclass instances Replacing the Parse type with a monad stack Exercises Transformer stacking order is important Putting monads and monad transformers into perspective Interference with pure code Overdetermined ordering Runtime overhead Unwieldy interfaces Pulling it all together Monads provide a powerful way to build computations with effects. Each of the standard monads is specialised to do exactly one thing. In real co...

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