Perl 6
Perl 6 Basics Tablet: Revision 12

Overview - Chapter: 0:History, 1:Design, 2:Basics, 3:Var, 4:Op, 5:IO, 6:{}, 7:Sub, 8:OOP, 9:Rx, 10:Meta
Intro - Appendices: A:Index, B:Tables, C:Cook, D:Delta, E:Best of, F:Links




1st law of language redesign: Everyone wants the colon for their particular syntax.
2nd law of language redesign: Larry gets the colon for whatever he wants.

Basics doesn't mean here easy but fundamental. Which mostly translates to how to format and reformat data (numbers, strings and more).

Defaults

Please note that any Perl 6 source code is treated as unicode by default. Also use strict; and use warnings; are enabled implicitly.

Statements

Unless you use blocks, a Perl program executes one statement after another in linear progression. They have to be separated by a semicolon (;), except before and after a closing curly brace, where it is optional.

Spaces and Indentation

Perl doesn't care about indentation. And spaces are still in many places without meaning. However these have become fewer.

Comments

Single Line

Like in Perl 5 and many other languages of its league a "#" tells the compiler to ignore the rest of the line.

Multi Line

#`( )

=begin comment
=end comment

POD

Number Literals

Konverting into numerical context means still: take from left to right all digits and other characters, up to the first char that clearly don't belong to a number definition and stop there.

A single underscore is allowed only between any two digits in a literal number, like:

$people = 3_456_789; # same as 3456789

Radix Prefixes

0b binary - base 2, digits 0..1
0o ocatal - base 8, digits 0..7
0d decimal - base 10, digits 0..9
0x hexadecimal - base 16, digits 0..9,a..f (case insensitive)

General Radix Form

:10<42> # same as 0d42 or 42

Scientific Notation

$float = 60.2e23 # becomes automatically 6.02e24
$float = 6.02E-23 # capital E works too

Rational Number

To distinguish them from a division operation, you have to groupe them with braces.

(3/7)
(3/7).numerator
(3/7).denominator
(3/7).nude.perl

As always, .perl gives you an almost source like code formatting which results here in 3/7. Adding .nude you get (3/7), the nude source code. There are 2 different immutable value types representing both rational number. FatRat has unlimited precision and Rat has just enough to be evaled into a Real type. When you explicitly type a variable to one o them, the braces become optional.

my Rat $other_pi = 22/7;

Complex Number

-3-6.02E-23i

Version Number

Quoting

Quoting is like regular expression a language on its own. It is parsed by it's own grammar as to be found in the special variable $~Q. The operator with the same name (the generic quoting operator) does almost nothing, just providing a mechanism to mark the beginning and end of text sequence. Almost like in Perl 5 you can take any not alphanumerical character or pair of matching (bracing) character for that purpose.

Q /.../ or Q |...| or Q *...* or Q "..." or Q[...] ...

Inside of these delimiters, every character will be taken literally. Any additional meaning has to be added by quoting adverbs. Some of the most useful have an additional syntax.

Quote Words

qw/.../
<...>
Q :w /.../;
Q :words /.../;

<<>>
Q :ww /.../;
Q :quotewords /.../;

Single Quotes

''
Q :q /.../;
Q :double /.../;

Double Quotes

""
Q :q /.../;
Q :double /.../;
Q :s, :a, :h, :f, :c, :b /.../;

Heredocs

Are now normal quoted strings, only with a special delimiter.

Q :to 'EOT';
...
...
EOT

To make templates in which variables and closures are evaluated, take the normal double quote and just add the adverb for the heredoc delimiter or define with other adverbs what exactly you want to have evaluated.

pp:to 'EOT';
EOT

Paths

Code

Regex

Formating

perl

The .perl method is a built in Data::Dumper (pretty printer) which gives you structured data the way you write it in perl source code.

fmt

sprintf

pack

Formats


Overview - Chapter: 0:History, 1:Design, 2:Basics, 3:Var, 4:Op, 5:IO, 6:{}, 7:Sub, 8:OOP, 9:Rx, 10:Meta
Intro - Appendices: A:Index, B:Tables, C:Cook, D:Delta, E:Best of, F:Links



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