I've been going over the perldocs and trying to figure this out for a few weeks now.. I'm rusty, but am trying to make use of map() to convert an array of lines from a log file into a hash of array of arrays keyed by one of the values in the logfile line.

An example format for a logline: 2010-08-10 13:59:54 GGS INFO 260 Something Something Manager for Monitor, mgr.prm: Lag for REPLICATION REP is 00:00:00 (checkpoint updated 00:00:02 ago).

The $key, in this line, would be "260" (without quotes).

The value would be the line itself, but as an array.

There could be many such "values" per $key, so the $key is not unique in this logfile. I thought a hash of arrays would fit the bill because,for each $key, there' be several lines. 

An excerpt from my current attempts:
 my %sorted_msgs = map { $_[5], $_[0] }
        sort { Date_Cmp($a->[1], $b->[1]) }
        map
        { 
              my @logline = split(/\s+/, $_, 5);
              my $timestring = '\'' . $logline[0] . ' ' . $logline[1] 
+. '\'';
              [ $_, ParseDate($timestring), $logline[0], $logline[1], 
+$logline[2], $logline[3], $logline[4] ];
        } @matched_lines;

[download]

In the split, after #5, I capture the rest of the logline.

The ParseDate is from Date::Manip, and works flawlessly in other routines, so i hope that doesn't distract from the question.

The first, inner map, is where I transform the array into anther, temporary array of values that I munged and/or want to be able to access. Then I do a sort on the timestamp, and, lastly, I (am trying) to convert values in the transformed array into a hash of arrays.

Dumper shows: DUMPER: $VAR1 = 'HASH(0x82442a0) ';

In reply to Using map to convert an array into a hash of array of arrays by rjoost

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