amalloy

amalloy has asked 35 questions and find answers to 585 problems.

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About

I play with Haskell and Clojure, and at work I develop Error Prone and other Java language tooling.

amalloy questions

Why is Postgres scanning a huge table instead of using my index?
How to create a limited version of the IO monad
How can I debug a non-responsive server, when the profiler can't collect samples?
How can I generate Modified http headers with Compojure?
Can I make git merge --ff act like --ff-only?
Working with data types parameterized by a functor
Mutually referring deftypes in Clojure
Why doesn't `coerce` implicitly apply Compose to these functions?
How to use recursion-schemes to `cata` two mutually-recursive types?
How to implement zip with foldl (in an eager language)

amalloy answers

Expression expansion using recursion schemes
Using Haskell map when functions needs an intermediate result
Reflection warning despite type hint to Java constructor in Clojure
Quoting Confusion
Haskell - applying a function that returns a functor onto a functor
Why can't I use Data.Function.(&) in the same expression as Control.Arrow.(>>>)?
Can I have a monitor in XMobar that keeps state form one invocation to the next?
What happens if a thread changes the value of an atom during `swap!`?
Why is there no conditional statements in the last line of this code?
Combine two Just values if present, else return first Just