Perl 5 to Perl 6 guide - overview

How do I do what I used to do?

These documents should not be mistaken for a beginner tutorial or a promotional overview of Perl 6; it is intended as a technical reference for Perl 6 learners with a strong Perl 5 background and for anyone porting Perl 5 code to Perl 6.

Perl 6 in a nutshell

Perl 6 in a Nutshell provides a quick overview of things changed in syntax, operators, compound statements, regular expressions, command-line flags, and various other bits and pieces.

Syntactic differences

The Syntax section provides an overview of the syntactic differences between Perl 5 and Perl 6: how it is still mostly free form, additional ways to write comments, and how switch is very much a Perl 6 thing.

Operators in Perl 6

The Operators section guides you from the operators in Perl 5's perlop to the equivalent in Perl 6.

Functions in Perl 6

The Functions section describes all of the Perl 5 functions and their Perl 6 equivalent and any differences in behavior. It also provides references to ecosystem modules that provide the Perl 5 behavior of functions, either existing in Perl 6 with slightly different semantics (such as shift), or non-existing in Perl 6 (such as tie).

Special variables in Perl 6

The Special Variables section describes if and how a lot of Perl 5's special (punctuation) variables are supported in Perl 6.


### Guidelines for contributions:

Headers should contain the text that a Perl 5 user might search for, since those headings will be in the Table of Contents generated for the top of the document.

We use POD =item instead of =head3 or =head4 for unchanged bits that need not appear in the table of contents.

This article does not describe the additions to syntax, nor details of possible improvements. For example, 0 + $string still works, even though we would write it as +$string now. (Blue Tiger will offer a Perl Modernization guide, with step-by-step procedures for translation, along with details of new idioms and "better ways to do it")

Example code and links to other documents should be favored over long explanations of details better found elsewhere.

Finally, if a real user asks a P5->P6 question not answered here, please add it to the document, even if we don't have a good answer yet. That will be better than losing the information about a real need.