How to access contents of a reference to a hash.

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

Replies are listed 'Best First'.
Re: How to access contents of a reference to a hash. by ambrus (Abbot) on Jan 31, 2005 at 12:36 UTC
The way you initialize the hash is wrong. Add `use warnings; use diagnostics;` to the top of your script to see why.	[reply] [d/l]
Re^2: How to access contents of a reference to a hash. by opensourcer (Monk) on Jan 31, 2005 at 12:47 UTC
thanks a lot it's really helpfull `perl -> 'hacker"' hello -> 'world,' says -> '=>' "just -> 'another'` [download] but i want some thing like this `hello -> 'world,' says ->just another perl hacker` [download]	[reply] [d/l] [select]
Re^3: How to access contents of a reference to a hash. by opensourcer (Monk) on Jan 31, 2005 at 12:52 UTC
i got it `#!/usr/bin/perl use warnings; use diagnostics; my %hash = ('hello' => 'world', 'says' => 'just another perl hacker'); my $hashref = \%hash; foreach my $k (keys %$hashref) { print "$k -> '$hashref->{$k}'\n " }` [download] Thanks a lot guys	[reply] [d/l]
Re^4: How to access contents of a reference to a hash. by opensourcer (Monk) on Jan 31, 2005 at 13:04 UTC
Re: How to access contents of a reference to a hash. by Corion (Patriarch) on Jan 31, 2005 at 12:31 UTC
There is the easy way: `print $hashref->{hello};` [download] That easy way is not enough if you need something like the "original hash" %hash: `print join "\n", sort keys %{$hashref};` [download] Most likely, tyes References quick reference will be of help when you're dealing with references. Update: As ambrus points out, I didn't read your code close enough - you are initializing the hash wrong. Assign a list to the hash, not a hash reference: `my %hash = ( hello => 'world', foo => 'bar', );`	[reply] [d/l] [select]
Re: How to access contents of a reference to a hash. by borisz (Canon) on Jan 31, 2005 at 12:33 UTC
Look at each and keys. If you just want to look at the content, Data::Dumper is a fine choice. `use Data::Dumper; print Dumper($hashref);` [download] Boris	[reply] [d/l]
Re: How to access contents of a reference to a hash. by DaleCooper (Initiate) on Feb 01, 2005 at 13:53 UTC
This requires the De reference operator use what you find at the end of reference, in Perl you use '->' `#!/usr/bin/perl my %hash = {'hello' => 'world', 'says' => 'just another perl hacker'}; my $hashref = \%hash; print "$hashref->{'says'} in the $hash{'world'}\n" ;` [download] Will return: just another perl hacker in the world	[reply] [d/l]