On 12/10/2012 04:39 PM, Rich Johnson wrote:
I am working my way through Intermediate Perl and have a question concerning one of the exercises (It's a long-ish exercise, so I won't bother typing it out as it's irrelevant to the question at hand). The author's solution contains the following code:... code ... my ($gather, $yield) = gather_mtime_between($start, $stop); find($gather, @starting_directories); my @files = yield->(); ... more code ... sub gather_mtime_between{ my ($begin, $end) = @_; my @files; my $gatherer = sub { * my $timestamp (stat $_)[9]* unless (defined $timestamp) { warn "..."; return; } ... }; ... } My question is about the bold: Where is $_ getting its value?
first off, did you type that code in by hand? there is no = in the line you marked with **.
you need to read the docs on the File::Find module. it does a callback to a sub (in this case the code ref assigned to $gather from gather_mtime_between). before it does each callback find() sets $_ to the file it just found. there are other things set globally by find which can be very useful so learn more about that module.
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