Arrays and hashes can both be used as lists, witness: 
my %F =   (a=>1, b=>2, c=>3);
my @F = qw(a 1 b 2 c 3);
foo(%F);
foo(@F);

[download]
#New simpler code to avoid slices
my %F =   (a=>1);
my @F = qw(a 1);
foo(%F);
foo(@F);

[download]
Within each code block both calls to foo pass the same values; @_(the parameters list) will be the same. NOTE: It is luck that the first works, as it relies upon the particular key/value pairs and how the current implementation of hashes in perl works.

Basically an array is an actual thing that lives somewhere and has an address (you can get a glob for it, you can use a reference to it), but that is not so for a list.

UPDATE: Modified code to ensure hash order prompted by dmmiller2k's reply. Which of course makes the comparison a little less clear since it uses slices. Added a second code block to reclarify

UPDATE I am an idiot. The sliced version only returned the values. And it did in fact work as advertised to begin with. It was just lucky that it did so. Added the NOTE, I really do understand this, but apparently I'm not very good at explaining it with code ;-)

--
perl -p -e "s/(?:\w);([st])/'\$1/mg"

In reply to Re: What is the difference between a list and an array? by belg4mit
in thread What is the difference between a list and an array? by sierrathedog04

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