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

 Live Demo

#!/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