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Perl 6 Deep Dive

You're reading from   Perl 6 Deep Dive Data manipulation, concurrency, functional programming, and more

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787282049
Length 402 pages
Edition 1st Edition
Languages
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Author (1):
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Andrew Shitov Andrew Shitov
Author Profile Icon Andrew Shitov
Andrew Shitov
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Table of Contents (15) Chapters Close

1. What is Perl 6? FREE CHAPTER 2. Writing Code 3. Working with Variables and Built-in Data Types 4. Working with Operators 5. Control Flow 6. Subroutines 7. Modules 8. Object-Oriented Programming 9. Input and Output 10. Working with Exceptions 11. Regexes 12. Grammars 13. Concurrent Programming 14. Functional Programming 15. Reactive Programming

Anonymous subs

A subroutine without a name is called an anonymous sub. You cannot call it by name, but it is still possible to run it via a handle, which, for example, is stored in a variable. All the attributes of a regular sub, such as a signature and a body, are defined in the same way as the normal subs.

In the following code, we will create an anonymous sub and save it in the $add variable; a space before the signature is required:

my $add = sub ($x, $y) {$x + $y}
say $add(10, 20); # 30

Perl 6 allows a mixture of regular and anonymous subs. The anon keyword creates an anonymous sub out of the regular one, so its name can still be used to call it. First, look at the sub, which can be used both as an anonymous one and be called by its name:

my $add = sub add ($x, $y) {$x + $y}
say $add(1, 2); # using anonymous sub
say add(3, 4);  # using regular sub call by name

Now, let us...

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