Re: mapM/concatMapMy

Sengan Baring-Gould writes:

Is >>= not lazy?

since no experts have answered yet, this newbie will answer. I think it's strict. somewhere in the compiler doco, IIRC, it says (>>=) was lazy at first, but experience showed it was more confusing for users (Haskell programmers). moreover, from the hslibs documentation, LazyST chapter: "The lazy ST monad tends to be more prone to space leaks than the strict version, so most programmers will use the former unless laziness is explicitly required." http://haskell.org/ghc/docs/latest/set/sec-lazyst.html