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Add and Remove Elements in Perl Hashes
Adding a new key/value pair in a Perl hash can be done with one line of code using a simple assignment operator. But to remove an element from the hash you need to use delete function as shown below in the example −
Example
#!/usr/bin/perl
%data = ('John Paul' => 45, 'Lisa' => 30, 'Kumar' => 40);
@keys = keys %data;
$size = @keys;
print "1 - Hash size: is $size\n";
# adding an element to the hash;
$data{'Ali'} = 55;
@keys = keys %data;
$size = @keys;
print "2 - Hash size: is $size\n";
# delete the same element from the hash;
delete $data{'Ali'};
@keys = keys %data;
$size = @keys;
print "3 - Hash size: is $size\n";Output
This will produce the following result −
1 - Hash size: is 3 2 - Hash size: is 4 3 - Hash size: is 3
Updated on: 29-Nov-2019
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