September 2016
Intermediate to advanced
408 pages
9h 18m
English
Content preview from Haskell High Performance ProgrammingBecome 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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Recursion and accumulators
Recursion is perhaps the most important pattern in functional programming. Recursive functions are more practical in Haskell than in imperative languages, due to referential transparency and laziness. Referential transparency allows the compiler to optimize the recursion away into a tight inner loop, and laziness means that we don't have to evaluate the whole recursive expression at once.
Next we will look at a few useful idioms related to recursive definitions: the worker/wrapper transformation, guarded recursion, and keeping accumulator parameters strict.
The worker/wrapper idiom
Worker/wrapper transformation is an optimization that GHC sometimes does, but worker/wrapper is also a useful coding idiom. The idiom consists ...
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