The document discusses various programming languages, particularly focusing on Perl6, and showcases coding examples that use different syntax and features for basic functions such as printing 'hello!' and calculating factorials. It also illustrates more complex operations, like generating date-related outcomes and creating an inverted index for search terms. Additionally, it highlights the expressivity of Perl6 in comparison to other languages and provides references for learning more about the language and its applications.

1. Perl6 – Am I Bovvered?

3. say “Hello” … X Factor

4. Hello Earthling???!!!

5. But the Genius® at the Apple Store
told me it would connect!!??

6. Who has the X Factor?
puts “Hello!”
'Hello!' printNl.
print(“Hello!”);
System.out.println(“Hello!”);
“Am I Bovvered?”

7. “Yeah But No But Yeah”
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello!");
}
}

8. (format t "Hello!~%")
#include <iostream>
int main () {
std::cout << "Hello!" << std::endl;
return std::cout.bad();
}
“Stop giving me evils!”
console.log("Hello!");
say “Hello!”;

9. Perl5 <=> Perl6
→

10. linguistics ~ comp sci
Larry Wall ~~ Cunning Linguist

11. Rosetta Stone Code
http://rosettacode.org
● A+ to ZED
● 501 Languages
● Hundreds of Tasks

13. Expressitivity
# Perl5 old Skool
sub factorial {
my $n = shift;
my $result = 1;
for (my $i = 1; $i <= $n; ++$i) {
$result *= $i;
};
$result;
}

14. Iterative / Recursive / Declarative?
Expressive
sub postfix:<!> { [*] 1 .. $^n }
say 5!; # prints 120

15. [Meta] WAT?
­ operators on operators

16. [Reduction Meta Operator]
my @numbers = 1 .. 3;
say [+] @numbers;
say [max] @numbers;
say [min] @numbers;
say [~] @numbers;
say [>] @numbers;
say [<] @numbers;
say [>] @numbers.reverse;

17. [Reduction Meta Operator]
my @numbers = 1 .. 3;
say [+] @numbers; # 6
say [max] @numbers; # 3
say [min] @numbers; # 1
say [~] @numbers; # 123
say [>] @numbers; # False
say [<] @numbers; # True
say [>] @numbers.reverse; # True

18. [Reduction Meta Operator]
my @numbers = 1 .. 3;
say [+] @numbers;
say [max] @numbers;
say [min] @numbers;
say [~] @numbers;
say [>] @numbers;
say [<] @numbers;
say [>] @numbers.reverse;

19. X product – Meta Operator
my @suits = < >;♣ ♢ ♡ ♠
my @ranks = 2..10, <J Q K A>;
my @deck = @ranks X~ @suits;
my @hand = @deck.pick(5);
say @hand;
nige@hammer:~/megameet­talk$ perl6
hand.p6
7 5 2 J 10♣ ♡ ♣ ♠ ♠

20. Whipupitude
multi sub MAIN ($number-of-nodes) {
say "deploy to: $number-of-nodes nodes";
}
nige@hammer:~/megameet-talk$ perl6 deploy.p6
Usage:
deploy.p6 <number-of-nodes>

21. Whipupitude
multi sub MAIN (Int $number-of-nodes) {
say "deploy to: $number-of-nodes nodes";
}
nige@hammer:~/megameet-talk$ perl6 deploy.p6 live
Usage:
deploy.p6 <number-of-nodes>

22. Whipupitude
multi sub MAIN (Int $number-of-nodes) {
say "deploy to: $number-of-nodes nodes";
}
multi sub MAIN (Bool :$run-tests?,
Str :$cluster ='staging') {
say "running tests" if $run-tests;
say "deploying to cluster: $cluster-name";
}

23. Whipupitude
nige@hammer:~/megameet-talk$ perl6 deploy.p6 --help
Usage:
deploy.p6 <number-of-nodes>
deploy.p6 [--run-tests] [--cluster-name=<Str>]
nige@hammer:~/megameet-talk$ perl6 deploy.p6 --run-
tests --cluster=live
running tests
deploying to cluster: live

24. Utility
BOSS: “I need dates for all the last Fridays
of the month for this year”
Agile programmer grabs a highlighter and a
calendar.
BOSS: “Oh, and for any year out of the last
20”
Agile programmer opens up a terminal window …
and types ...

25. Python's Last Friday (14 LOC)
import calendar
c=calendar.Calendar()
fridays={}
year=raw_input("year")
for item in c.yeardatescalendar(int(year)):
for i1 in item:
for i2 in i1:
for i3 in i2:
if "Fri" in i3.ctime() and year in
i3.ctime():
month,day=str(i3).rsplit("-",1)
fridays[month]=day

26. Last Friday in Perl6 (5 LOC)
sub MAIN (Int :$year = Date.today.year) {
my @fri;
for Date.new("$year-01-01") .. Date.new("$year-12-31"){
@fri[.month] = .Str if .day-of-week == 5;
}
.say for @fri[1..12];
}
nige@hammer:~/megameet-talk$ perl6 date.p6 --help
Usage:
date.p6 [--year=<Int>]
nige@hammer:~/megameet-talk$ perl6 date.p6
2013-01-25

27. Simple Search Engine
Inverted Index (11 LOC)
sub MAIN (*@files) {
(my %norm).push: do for @files -> $file {
$file X=> slurp($file).lc.words;
}
(my %inv).push: %norm.invert.uniq;
while prompt("Search terms: ").words -> @words {
for @words -> $word {
say "$word => %inv.{$word.lc}";
}
}
}

28. Oh my god that is so unfair!
package org.rosettacode;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

29. -O Fun camelia => http://perl6.org

31. Rosetta Stone Code
http://rosettacode.org
● A+ to ZED
● 501 Languages
● Hundreds of Tasks