Pop() Goes Your Data - Perl

In our last article we talked about lists, going somewhat in-depth on their capabilities. We talked about creating them, printing from them, and even used a slicing technique to add and remove from our lists. In this article we will start off looking at more traditional ways to add and remove from a list, and move on from there.

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By: James Payne

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March 24, 2008

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What else is there to say about the pop() function? Nothing, that's what. Here is the code:

#!/usr/bin/perl

@gladiators=('Nitro ', 'Blaze ', 'CountFistula ', 'TheNutcracker ', 'Glutious-Minimus ');

@new=('Max Fightmaster ');

push(@gladiators, @new);

print @gladiators;

print "\n\n";

$deleted=pop(@gladiators);

print @gladiators;

print "\n\n";

print $deleted;

This code again creates the two lists and adds the values to them, then uses push() to add the data from @new to @gladiators. We print out the value of @gladiators to show it worked, and then create a new variable named $deleted, using the pop() function to remove the last element in the @gladiators array and store it in $deleted. Finally, we print out the values of both the @gladiator list, and the $deleted variable, resulting in (takes a deep breath):

Nitro Blaze CountFistula TheNutcracker Glutious-Minimus Max Fightmaster

Nitro Blaze CountFistula TheNutcracker Glutious-Minimus

Max Fightmaster

You will note that when we remove data from a list in this manner it gets stored in a variable, not a list. Likewise, you cannot, with this method, deduct data from a list using another list; again, this is because you are simply removing the end element, and not "elements."

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