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Perl
By
Warren David Cocke
Greg Wallace
Josh Johnson
Perl

Object-Oriented
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Procedural
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Functional
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Developed as a Writing Tool
Perl History
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Developed By Larry Wall
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1987
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Originally used to extracting text information
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1989, Perl 3.0 Released Open Sourced
Perl Development
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It was developed as a glue language
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1991, Perl 4 released with first book
“Programming Perl”
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1994, Perl 5 released with major changes
Perl 5 added objects, perldoc, and new
functions
It became “duct tape of the Web”
Perl 5 Concepts
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Object-Oriented Programming
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Classes
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Objects
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Methods
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Modules
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64 bit support
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Still used today
Perl 6 Concepts
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Being Developed
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Lazy Evaluation
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Junctions: values that are composites of other
values
Autothreading: Compiler can choose to
evaluate junctive expressions in parallel
Perl 6 Concepts

Multimethods
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Roles – like interfaces in Java
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Macros
Example Program
use Backpack;
use Items;
my $bag = Backpack->new(color => 'red'); # Creates a new Object
$bag->add_items(
Candle->new,
Spellbook->new,
Sandwich->new,
); # Adds Objects to the backpack object
Comparison
Java

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Requires Java
Environment
Requires a compiler
Works well in multithread applications
Great for Distributed
Applications
Python

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Whitespace
Indentation
Object-Oriented and
Functional
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Easier to Read
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General Purpose