[Haskell-cafe] for = flip map
waldmann at imn.htwk-leipzig.de
Wed Mar 28 21:58:20 CEST 2012
Good: we have mapM, and we have forM ( = flip mapM ) .
Sure this is just a convenience, and indeed
"forM xs $ \ x -> do ..." is quite handy,
especially if "xs" is really small,
and "..." is some larger expression.
Bad: we have map, but we are missing: for ( = flip map ) .
The function is very convenient, for the same reasons as above.
I can't remember how often I typed "for = flip map" in a source file.
I never put this definition in a module either,
since the import statement would be longer than the definition.
So, I'm all for "for" .
In Data.List? In the Prelude? (Should put it right next to "map".)
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