Скачать или смотреть Developer's tutorials: Perl 05: Arrays and Hashes Don't need Quotation Marks

“In Perl, numbers and strings are shape-shifters.
Perl’s values don’t have types — operations do.”


"There are only three data types in Perl:
-scalar
-array
-hash (associative array)"


use v5.42;
my %title = (
Alice => "software engineer",
Bob => "project manager",
Carol => "sales agent",
Don => "jester",
Eve => "director"
);

my @attendees = qw(Alice Bob Eve);

for my $name(@attendees) {
say "$name is a $title{$name}";
}


"Perl programs often begin with a version line.
Now we create a hash of keys and values.
Here the keys are names, and the values are job titles.
Notice that there are no quotation marks around the keys.
Perl automatically treats them as strings, even without quotes.
The arrows between them mean each key is linked to its value. "


"Next we create an array, called @attendees.
The letters qw mean quote words.
That is Perl’s way to make a list of words without typing quotation marks around each one. "


"Perl looks up that name in the hash and gives us the matching value.
The result is a simple report.
Each person’s name, and their role."