May be i am missing a basic understanding here.In order to understand what that block does practically i wrote a small program below

#!/usr/bin/perl -w
use strict;
my @array=qw(John Sue Larry Mary John Mary Larry John Joe Lisa John Ma
+ry);
my %hash;

foreach (@array)
         {
           $hash{$_}++;
          }
foreach (keys %hash)
          {
              print"Key is : [$_]\n";
           }
foreach (values %hash)
           {
                print "Value is : [$_]\n";
            }
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After executing the code the output i got is

Output: key is :joe Key is :Lisa and so on..and value is no.of time they repeated. I realized the block of foreach array is assigning the list to hash but my doubt is nowhere i assigned array elements to hash and how come keys got assigned and values got assigned from array elements. I am new to programming.I guess i am missing basic understanding pardon me and guide. Thanks