amalloy

amalloy has asked 35 questions and find answers to 578 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

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
Simple `Read` instance incorrectly `read`s
Automatically detect whether a Haskell function is tail recursive
Alternative of Show that only uses name
how to check if a nested key exists in a map
How do I spec higher order function arguments in Clojure?
Why do we see Arity related exceptions at runtime in Clojure?