Easy syntax question

Mark Carroll [email protected]
Mon, 27 Aug 2001 15:02:24 -0400 (EDT)


I can write a function x :: Integer -> Integer that returns 5 if I give it
2, 5 or 9, or 7 otherwise. Say,

x 2 = 5
x 5 = 5
x 9 = 5
x _ = 7

Generally, this is a question about where multiple cases lead to the same
thing, maybe even in the middle of a function. (Like C's "case 1: case 2:
case 3: foo; break;".)

Does it get any better than this, though? I can't convince 'case' to do
something like,

case n of
  2,5,9 -> 5
  otherwise -> 7

Am I missing some syntax somewhere? I'm lost in the grammar in the Haskell
report.

-- Mark