November 2015
Intermediate to advanced
166 pages
3h 14m
English
Content preview from Haskell Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Modernizing Haskell 98
The introduction of
Applicative, along with Foldable and Traversable, have had a big impact on Haskell.
The Foldable and Traversable typeclasses lift the Prelude fold and map functions to a much higher level of abstraction. Moreover, Foldable and Traversable also bring a clean separation between processes that preserve or discard the shape of the structure being processed:
Traversabledescribes a process that preserves the shape of the data structure being traversed overFoldablediscards (or transforms) the shape of the structure being folded over
Since Traversable is a specialization of Foldable, we can say that shape preservation is a special case of shape transformation. This line between shape preservation and transformation ...
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