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Is this a bug in Perl?
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| use strict; | |
| use warnings; | |
| use Data::Dumper; | |
| my $things = { foo => 'bar' }; | |
| foreach my $word (qw(foo baz bar quux)) { | |
| my $count = grep { defined } $things->{$word}; | |
| print "$count\n"; | |
| } | |
| # $things now has entries for foo, bar, baz and quux | |
| # tested on: | |
| # perl 5, version 14, subversion 1 (v5.14.1) built for x86_64-linux | |
| # perl 5, version 14, subversion 2 (v5.14.2) built for cygwin-thread-multi-64int (with 7 registered patches) | |
| # perl, v5.8.8 built for x86_64-linux-thread-multi | |
| print Dumper($things); | |
| __END__ |
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No, it's not a bug. It's Perl's autovivification doing funny things.