Programming Course - Hashes (6)

Hashes

The keys function

The keys function yields a list of all the current keys in a given hash. Example:

#!/usr/local/bin/perl
use strict;
use warnings;

my %prices = ("shirt"    => 45,
              "pullover" => 90,
              "trousers" => 120,
              "socks"    => 15);
           
my @items = keys (%prices);

print "ITEMS: @items\n";

Result:

ITEMS: pullover shirt socks trousers

Iterating over all hash elements using the keys function:

Example - printing all keys and values of the %prices hash:


my @items_list = keys (%prices);
foreach $item (@items_list) {
   print "$item : $prices{$item} NIS\n";
}

or, shorter:

foreach $item (keys (%prices)) {
   print "$item : $prices{$item} NIS\n";
}

Result:

pullover : 90 NIS
shirt : 45 NIS
socks : 15 NIS
trousers : 120 NIS

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