>>>>> "BM" == Brandon McCaig <bamcc...@gmail.com> writes:
BM> On Fri, Sep 16, 2011 at 2:55 PM, Paul Johnson <p...@pjcj.net> wrote:
>> map EXPR, @a is just the same as map { EXPR } @a.
BM> The part that I find confusing is that EXPR is evaluated against each
BM> $_, as opposed to once when map is called, passing the resulting value
BM> into map. :) Obviously it's just one of the many magical features of
BM> Perl at work here. :) I don't think that there's any way for a
BM> user-defined sub to do this; or is there?
the whole point of map/grep is to evaluate the expression/block for each
element of the input list. so there has to be a way to access the
current element in the expression and that is $_. and i just posted in
this thread you can pass a code block to a sub as the first argument by
using prototypes. File::Slurp::edit_file_lines does both of those tricks.
uri
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