Raku - Programming language

Raku is a programming language created in 2015 by Larry Wall.

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Raku is a member of the Perl family of programming languages. Formerly known as Perl 6, it was renamed in October 2019.While historically several interpreter and compiler implementations were being written, today only the Rakudo implementation is in active development. Raku introduces elements of many modern and historical languages. Read more on Wikipedia...

Tags: programming language
There are at least 2,521 Raku repos on GitHub
Early development of Raku happened in https://www.raku.org/community
The Google BigQuery Public Dataset GitHub snapshot shows 2k users using Raku in 2k repos on GitHub
GitHub supports syntax highlighting for Raku
raku.org was registered in 1999
8 PLDB concepts link to Raku: Ace Editor, Alma, cloc, Muldis, Pygments, Rakudo, Star, TestML

Example from the web:

grammar Parser {
    rule  TOP  { I <love> <lang> }
    token love { '♥' | love }
    token lang { < Raku Perl Rust Go Python Ruby > }
 }
 
 say Parser.parse: 'I ♥ Raku';
 # OUTPUT: ｢I ♥ Raku｣ love => ｢♥｣ lang => ｢Raku｣
 
 say Parser.parse: 'I love Perl';
 # OUTPUT: ｢I love Perl｣ love => ｢love｣ lang => ｢Perl｣
 start { sleep 1.5; print "hi" }
 await Supply.from-list(<A B C D E F>).throttle: 2, {
     sleep 0.5;
     .print
 }
 # OUTPUT: ABCDhiEF
 # No floating point noise:
 say 0.1 + 0.2 == 0.3;        # OUTPUT: True
 say (1/13 + 3/7 + 3/8).perl; # OUTPUT:  <641/728>
 # Infinite list of primes:
 my @primes = ^∞ .grep: *.is-prime;
 say "1001ˢᵗ prime is @primes[1000]";
 
 # Lazily read words from a file
 .say for '50TB.file.txt'.IO.words;

Example from hello-world:

say "Hello World";

Example from Linguist:

# used in t/spec/S11-modules/nested.t

BEGIN { @*INC.push('t/spec/packages') };

module A::A {
    use A::B;
}

# vim: ft=perl6

Language features

Feature	Supported	Example	Token
Comments	✓	# A comment
Line Comments	✓	# A comment	#
Operator Overloading	✓
Multiple Inheritance	✓
Strings	✓	"Hello world" 'Hello world'	"
Print() Debugging	✓		say
Comments	✓	# A comment
Line Comments	✓	# A comment	#
Function Composition	✓	my &foo = &f ∘ &g;
Refinement Types	✓	subset Color of Any where Color \| CMYK_Color;
hasGradualTypes	✓
Semantic Indentation	X
Semantic Indentation	X