Scope of Hash of arrays.

425cds has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Scope of Hash of arrays. by tcf22 (Priest) on Sep 18, 2003 at 19:36 UTC
Can you post some of the surrounding code. I can't reproduce the error except for doing this, and doubt this is what you are doing `my %hash; $hash{test} = {}; push @{$hash{test}}, 1, 2; use Data::Dumper; print Dumper \%hash;` [download] I've tried various things like `my %hash; #Tried these things #$hash{test} = 'test'; #$hash{test} = 1; push @{$hash{test}}, 1, 2; use Data::Dumper; print Dumper \%hash;` [download] They all didn't have the desired result(some didn't push), but they didn't throw that error. This is on Win32 Perl 5.6. - Tom	[reply] [d/l] [select]
Re: Scope of Hash of arrays. by zby (Vicar) on Sep 18, 2003 at 18:26 UTC
`zby@moria:~$ perl -e 'push @{ $listSample{Bank} }, 1,2' zby@moria:~$ perl -we 'push @{ $listSample{Bank} }, 1,2' Name "main::listSample" used only once: possible typo at -e line 1. zby@moria:~$ perl -we 'if(1){push @{ $listSample{Bank} }, 1,2}' Name "main::listSample" used only once: possible typo at -e line 1. zby@moria:~$ perl -e 'if(1){push @{ $listSample{Bank} }, 1,2}' zby@moria:~$` [download] For me it works inside and outside a block. It was perl 5.6.1	[reply] [d/l]
Re: Scope of Hash of arrays. by davido (Cardinal) on Sep 18, 2003 at 18:39 UTC
If you're trying to build up the array with pushes, maybe try this: `push @$hash{'Element'}, (1, 2, 3, 4, 5);` [download] The paranthesis are redundant, and are just there to make the list visually obvious. If you're adding one item at a time inside a loop it might look more like this. `push @$hash{'Element'}, $item;` [download] Or if you've got another array you're adding you could do it this way: `push @$hash{'Element'}, @array;` [download] If you're building the array up in one step you could do it this way, and additional elements could still be pushed onto it later: `$hash{'Element'} = [1, 2, 3, 4, 5];` [download] I would have to see a snippet of five or ten lines of code that exhibits the misbehavior you're describing before I could comment on what's wrong. Post a small segment of code that shows the problem and maybe we can help figure it out. FWIW, there isn't anything special about a hash of arrays that would make scoping different for that entity than for some other entity. Dave "If I had my life to do over again, I'd be a plumber." -- Albert Einstein	[reply] [d/l] [select]