Petr

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Petr has asked 254 questions and find answers to 399 problems.

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Petr questions

How to define foldM using foldr/foldl (if it is possible)?
How to implement the inverse of "intercalate" (splitting a string into pieces on a character) using functions from "base"?
Are there monadic/applicative map (i.e. traverse/mapM) functions over ByteString or Text?
How are Scala's local lazy variables implemented?
How to interrupt asynchronous computations in Scala?
How would one create a proper polymorphic Functor instance failing on unsafeVacuous?
Slicing an IOArray (or MArray in general)
What's more costly on current CPUs: arithmetic operations or conditionals?
How to set up vim's identation for literate Haskell programming?
Is there any real disadvantage in building all libraries with profiling enabled?

Petr answers

Threading extra state through a parser in Scala
Logging from within a Functional Programming Paradigm
Scala: Idiomatic way to generate a fixed length sequence (folding infinite stream?)
Multi-threading in Scala -- dealing only with immutability
Advice on writing monadic signatures
How can I write a pipe that sends downstream a list of what it receives from upstream?
Compiler fooled by mention of recursive function in non-tail position
Why is Alternative concatenating lists instead of choosing the first non-empty one?
Tail recursive binomial coefficient function in Haskell
Misunderstanding of scala 'match' compile rules