Conway says that it is much clearer to use reverse than to flip $a and $b around in a sort block. He also suggests that, in newer perls, reverse is specifically looked for and optimized, and in the case of a simple reversed string sort, using reverse with a sort with no block is faster even in old perls.

  my @foo = sort { $b cmp $a } @bar;         #not ok
  my @foo = reverse sort @bar;               #ok

  my @foo = sort { $b <=> $a } @bar;         #not ok
  my @foo = reverse sort { $a <=> $b } @bar; #ok


Chris Dolan <>


Copyright (C) 2006 Chris Dolan. All rights reserved.

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