[Haskell-cafe] Parse text difficulty
Keith.Wansbrough at cl.cam.ac.uk
Thu Dec 9 07:58:09 EST 2004
> numLines :: [Line] -> [(Int, Line)]
> numLines lines -- list of pairs of
> = zip [1 .. length lines] lines -- line no. & line
zip stops when it reaches the end of the shorter list, so you can just say
zip [1 ..] lines
In fact, most programmers use the infix version of zip, like this:
[1..] `zip` lines
which is nicely readable. (any function can be turned into an infix by surrounding it in `backticks`).
Keith Wansbrough <kw217 at cl.cam.ac.uk>
University of Cambridge Computer Laboratory.
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