On Dec 11, 2006, at 18:48 , Steve Downey wrote:
the typical good solution to this problem in c or c++ is to use a
string reverse function on the entire buffer, then re-reverse each
word. this leaves multiple spaces correctly embedded in the larger
string.
that approach, of course, won't work in haskell, since it relies on
updates. but if the challenge includes transforming "one two three
four " into " four three two one", how could this be done?
Off the top of my head, the C++ one translates to:
*Main> concatMap reverse . groupBy (\l r -> (l == ' ') == (r == '
')) . reverse $ "one two three four "
" four three two one"
There are almost certainly more idiomatic ways to do it, but I'm
still learning.
--
brandon s. allbery [linux,solaris,freebsd,perl] [EMAIL PROTECTED]
system administrator [openafs,heimdal,too many hats] [EMAIL PROTECTED]
electrical and computer engineering, carnegie mellon university KF8NH
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