[dllthomas]

I find it often winds up clearer to pull things into multiple case statements, especially as the code grows more complicated. That said, there may be a difference in what we 're meaning by "most of the time," so let's be more precise. IME, most Haskell programmers will encounter use cases for multi-level matches (beyond simply pulling the first couple elements off a list) a small number of times per week (maybe month, depending on the programmer), whereas they're typically writing a case statement some number of times per hour.

I wouldn't call it a party trick, but I also wouldn't say it's the most common use of case by a long shot. I don't expect that you disagree.

[thinkpad20]

I find that Haskell (both mine and that of others) involves a lot less pattern matching than ReasonML, since control flow is often expressed by type classes. Unfortunately, these are lacking in reasonml, and I think that might contribute to why you tend to see more explicit pattern matching there. But maybe that’s an incorrect impression. In either case, it’s not common all the time, but neither is it particularly rare.