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Re: How to add to hash of a hash of an array.!

by roboticus (Chancellor)
on Jun 13, 2013 at 11:38 UTC ( #1038723=note: print w/replies, xml ) Need Help??

in reply to How to add to hash of a hash of an array.!


If the item doesn't exist, you're just going to create it anyway, so why not just use:

push @{$hash{A1}{B2}{C1}}, $item;

Without showing more of your code, we can't be sure exactly what your problem is. I'm suspecting that it's due to the fact that sometimes your B-level variable is a string and sometimes it's a hash reference. Perhaps $hash{A1}{B2} was a string a moment before executing the code you've shown--that would be enough to cause the problem:

$ perl Can't use string ("") as a HASH ref while "strict refs" in use at ttt3 line 7. * /W/P/PM/ monitor_saints; check TODO_LIST $ cat #!/usr/bin/perl use strict; use warnings; use Data::Dumper; my %hash; $hash{A1}{B2} = ""; if (exists $hash{A1}{B2}{C1}) { print "Baz!\n"; }


When your only tool is a hammer, all problems look like your thumb.

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