In perl, if we want to get the key/value pairs of hash, you can use the following code.
use strict;
use warnings;
# initializing hash with three four-value pairs, among those two are h
+aving inner hashes ( Numerals, Alpha ) which have three key-value pai
+rs in-built
my %hash = ( 'Numerals' => {
'1' => 'One',
'2' => 'Two',
'3' => 'Three',
}, 'Alpha' => {
'A' => 'Apple',
'B' => 'Ball',
'C' => 'Cat'
},
'I' => 'Roman One',
'II' => 'Roman Two'
);<br/>
# for getting key-value pairs of above hash
foreach(keys%$hash) {
# by default key stored in $_ as per above foreach statement
# checks whether value of hash is another hash
if(ref($hash{$_}) eq 'HASH') {
# iterate the keys set of inner hash
foreach my $inner_key (keys%{$hash{$_}}) {
# printing key and value of inner hash
print "Key:$inner_key and value:$hash{$_}{$inner_key}\n";
}
} else {
print "Key: $_ and Value: $hash{$_}\n"
}
}
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