Re^2: using hashes to count

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Re^3: using hashes to count by Joost (Canon) on Jun 14, 2007 at 23:13 UTC
++, -- (both pre and postfix versions), -= and += are exempt from that warning precisely because of this common use: `perl -Mstrict -w -e'my $f; $f++; print "$f\n"'` [download] prints (only) `1` [download] "What should it profit a man, if he should win a flame war, yet lose his cool?"	[reply] [d/l] [select]
Re^3: using hashes to count by nferraz (Monk) on Jun 15, 2007 at 09:43 UTC
Usual way: `my @strings = qw/ a a b c a b c d e a b c a b c d /; my %count; foreach ( @strings ) { $count{$_} \|\|= 0; $count{$_}++; } # Then, if you want to sort the results by value: foreach ( sort { $count{$a} <=> $count{$b} } keys %count ) { print "$_ => $count{$_}\n"; }` [download]	[reply] [d/l]
Re^4: using hashes to count by ikegami (Patriarch) on Jun 15, 2007 at 13:16 UTC
The `$count{$_} \|\|= 0;` is useless. `++` doesn't give undefined warnings.	[reply] [d/l] [select]
Re^4: using hashes to count by spiros (Beadle) on Jun 15, 2007 at 10:00 UTC
Excellent, thank you very much.	[reply]