Re: Print the contents of a hash without looping.

> say "@{[%hash]}";

> since it appears to be dereferencing an array.

That's because the [...] creates an anonymous array ref and the %hash is expanded to a list inside.

I'd say this is cargo cult, say "%hash"; should have the exact same effect.

edit

I was wrong, it helps adding white-space through $"

#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';


my %hash = ();
$hash{name} = 'Michelle';
$hash{age}  = 22;
$hash{city} = 'Austin';

say "1: @{[%hash]}";
say "2: %hash";
say "3: ",%hash;
say "4: ", join $",%hash;
[download]

1: city Austin name Michelle age 22
2: %hash
3: cityAustinnameMichelleage22
4: city Austin name Michelle age 22
[download]

but I'd certainly prefer Data::Dumper or Data::Dump here, or at least say join " ", %hash

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Wikisyntax for the Monastery}

Comment on Re: Print the contents of a hash without looping. Select or Download Code

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Re^2: Print the contents of a hash without looping. by shmem (Chancellor) on Dec 02, 2017 at 11:40 UTC
Just for completenes - `say "%hash";` should have the exact same effect. Arguably it should, but it doesn't. A hash (or a construct with sigil %) is never interpolated in double quoted strings or `qq()`. I guess it is because, at list expansion of a hash, the sequence of key/value tuples is random. And then, the char % is meaningful for sprintf. However, hash slices are interpolated (their sigil is @). So, `my $hash = \%hash; say "5: %$hash"; say "6: @hash{keys %hash}"; say "7: @$hash{keys $hash}";` [download] `5: %HASH(0x1185900) 6: Michelle Austin 22 7: Michelle Austin 22` [download] perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'	[reply] [d/l] [select]
Re^2: Print the contents of a hash without looping. by BillKSmith (Monsignor) on Dec 02, 2017 at 04:23 UTC
Since you bring up the subject of special variables, we should point out that your case 3 is essentially the same as case 1, but uses $, instead of $". `do{ local $, = $"; say "5:", %hash;}` [download] Bill	[reply] [d/l]
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