Petr

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Petr has asked 254 questions and find answers to 397 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

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
Haskell which function to group list every n such that :: [a] -> Int -> [[a]]
Working with Maybe a, IO a, and MaybeT IO a