Learning From Ruby (Yapc Asia)

Learning from Ruby Kang-min Liu <gugod@gugod.org> YAPC::Asia::2009

Gugod->meta • • http://handlino.com/ Kang-min Liu gugod • http://gugod.org • http://search.cpan.org/ ~gugod/ • http://twitter.com/gugod • gugod@gugod.org

Learning from Ruby

Ruby is Lovely (The programming language)

Perl 6 Logo

Language

rubyisms.pm by Simon Cozens

rubyisms.pm • Class • new • self • super • yield

Perl ~~ Ruby

class Foo def bar self.baz end def self.bar self.baz end end

class Foo def bar object self.baz end def self.bar self.baz end end

class Foo def bar object self.baz end Class def self.bar self.baz end end

class Foo def bar baz end def self.bar baz end end

block syntax

def foo(arg1, arg2) yield(a, b) end foo(arg1, arg2) do |block_arg1, block_arg2| ... end

co-routine

callback

call me after you done that.

div(id => "content") do h1(id => "title") { "OHAI" } p(class => "block") { "Cheeze?" } end

app do alert(42) end

Good Built-in Classes

irb> 1..2**100 => 1..1267650600228229401496703205376 irb> (1..2**100).class => Range

(1..2**100).each do |i| puts 42 break if i >= 5 end

autobox

no Semicolon

Rubyish.pm It’s all sugar, honey.

Rubyish.pm • Kernel, Object, Module, Class • Array, Hash, String, TrueClass, NilClass, Enumerable • Syntax • def, nil, true, false

class Foo { }

def foo { # $self; }

def foo($arg1, $arg2) { }

see also: MooseX::Declare

my $array = Array[0..3]; if ($array->any { $_ > 2 }) { ... }

# Rubyish::Array $arr = Array[1..10]; # Rubyish::Hash $hash = Hash{ a => 42, b => "stuff" }; # Rubyish::String $str = String("FooBar");

ref: Class::Builtin

boolean • true – TrueClass • false - FalseClass • nli - NilClass

sub true() { Rubyish::TrueClass->new }

ref: boolean.pm and Acme::Boolean

Hash is lazy too

fib = Hash.new { |fib, k| fib[k] = fib[k-1] + fib[k-2] } fib[0] = 0 fib[1] = 1 puts fib[10] # => 55

Functional programming -ish

Memoize sub fib { my $n = shift; return $n if $n < 2; fib($n-1) + fib($n-2); } memoize('fib');

Lazy stuffs • Scalar::Lazy • Variable::Lazy • Scalar::Defer • Data::Thunk

Lazy stuffs • Tie::Array::Lazy • Tie::Array::Lazier • Hash + Lazy = ?

Hash::Lazy

Hash::Lazy my $fib = Hash { my ($h, $k)= @_; return $h->{$k-1} + $h->{$k-2} }; $fib->{0} = 0; $fib->{1} = 1; say $fib->{10}; # 55

Hash::Lazy • export “Hash” as the constructor • Hash::Lazy::Tie

Learnt • I hate doing tie • Spiffy constructors can be good read • Hash • Rubyish.pm: Array, Hash, String • Class::Builtin: OO

PerlX::MethodCall WithBlock Still more syntax sugar

Schwartzian Transform Ruby (0..10) .map { |i| i * 13 } .map { |i| i % 17 } .sort { |a,b| a <=> b }

Schwartzian Transform Perl5 sort { $a <=> $b } map { $_ % 17 } map { $_ * 13 } (0..10)

Schwartzian Transform autobox Perl5, with [0..10] ->map(sub { $_ * 13 }) ->map(sub { $_ % 17 }) ->sort(sub { $a <=> $b })

Schwartzian Transform Perl5, extended! [0..10]->map { $_ * 13 }->map { $_ % 17 }->sort { my ($a,$b) = @_; $a <=> $b };

Schwartzian Transform Perl5, extended! [0..10] ->map { $_ * 13 } ->map { $_ % 17 } ->sort { $_[0] <=> $_[1] }

PerlX :: MethodCallWithBlo ck

ref • B::OPCheck • lineseq, pushmark, const • B::Hooks::EndOfScope • Devel::Declare

ref • opcode.pl, opcode.h • B::Concise • B::Deparse

Community

Last month

Sh*t happened

Taiwan

Morakot

$WebSite.com

DisasterTW.com

DisasterTW.com • Forum • Initial Coding: 1 hour*woman.

1 day later

DisasterTW.com • Web 2.0 / Social-ish • Multi-Function • Mash-able

DisasterTW.com ✖ • Web 2.0 / Social-ish • Multi-Function • Mash-able

DisasterTW.com • Online ASAP • Robust (peak: 400k PV/day) • Well-known

DisasterTW.com • Rapid Prototyping • Cloud Computing • SEO / Social Network Friendly

DisasterTW.com • Ruby on Rails • Heroku + Panther CDN • Good HTML / Plurk button

DisasterTW.com • 6 heroku instances • Thousands of tweets about #morakot • Total Cost: ~50 USD

People are awesome

Tools are awesome

Problem →

What if it was a Jifty site?

@obra can haz dancing

@obra can haz dancing, naked

DisasterTW.com • Rapid Prototyping • Cloud Computing • SEO / Social Network Friendly

DisasterTW.com • Jifty • Cloud Computing • Good HTML / Plurk button

Heroku for Perl?

Ruby is Lovely

Ruby is a respectful friend of Perl

Ruby programmers are respectful friends of Perl programmers

Thanks for Listening

http://coderwall.com	6
http://www.slideshare.net	4
https://lti-examples.heroku.com	1
http://www.linkedin.com	1

Learning From Ruby (Yapc Asia)

by Kang-min Liu

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