Perl By Warren David Cocke Greg Wallace Josh Johnson

Perl Object-Oriented Procedural Functional Developed as a Writing Tool

Perl History Developed By Larry Wall 1987 Originally used to extracting text information 1989, Perl 3.0 Released Open Sourced

Perl Development It was developed as a glue language 1991, Perl 4 released with first book “Programming Perl” 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 Object-Oriented Programming Classes Objects Methods Modules 64 bit support Still used today

Perl 6 Concepts Being Developed Lazy Evaluation Junctions: values that are composites of other values Autothreading: Compiler can choose to evaluate junctive expressions in parallel

Perl 6 Concepts Multimethods Roles – like interfaces in Java 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 Requires Java Environment Requires a compiler Works well in multi- thread applications Great for Distributed Applications Python Whitespace Indentation Object-Oriented and Functional Easier to Read General Purpose