[Haskell-beginners] WWAAA... I hate monads
daniel.carrera at theingots.org
Wed Apr 22 06:21:14 EDT 2009
I hate monads.
I love 90% of Haskell. The functional stuff is beautiful, easy to
understand, crystal clear, elegant, etc. But I'm having a mighty hard
time getting my head around monads. Consider the following explanation
of a monad:
"A monad is represented as a type constructor (call it m), a function
that builds values of that type (a -> m a), and a function that combines
values of that type with computations that produce values of that type
to produce a new computation for values of that type".
1) I know what a type is, but not a "type constructor". I don't normally
think of an Int or even a complex type as being "constructed" except in
the sense of OOP which I know is not what the author means.
2) Just *read* the paragraph... "a type constructor, a function that
builds value of that type, and a function that combines values of that
type with computations that produce values of that type to produce a
computation of values of that type" Ugh....
Can anyone recommend a simple and clear explanation of monads? You can
assume that I know basic math and basic Haskell syntax. So, for example,
"a -> b" is much more clear than "a function that takes input of one
type and has an output of a different type".
Any help would be appreciated.
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