INTRODUCTION TO RUBY PETER COOPER If you get bored... - - PowerPoint PPT Presentation

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INTRODUCTION TO RUBY PETER COOPER If you get bored... - - PowerPoint PPT Presentation

Oct 27, 2022 253 likes •1.24k views

INTRODUCTION TO RUBY PETER COOPER If you get bored... www.petercooper.co.uk www.rubyinside.com www.ruby-lang.org THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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INTRODUCTION TO RUBY

PETER COOPER If you get bored... www.petercooper.co.uk www.rubyinside.com www.ruby-lang.org

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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Paul Graham

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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THE DOWNSIDES

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THE DOWNSIDES

SLOW

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THE DOWNSIDES

UNPOPULAR

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Java C

Visual Basic PHP

C++ Perl

Python

C#

Delphi Ruby

JavaScript D

PL/SQL SAS COBOL

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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Matz

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Matz

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Installing Ruby

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Installing Ruby

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IRB == Interactive RuBy

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tryruby.hobix.com

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IRB == Interactive RuBy

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Expressions

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Objects and Methods

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Method List

>> “this is a test”.methods

=> ["%", "select", "[]=", "inspect", "<<", "each_byte", "method", "clone", "gsub", "casecmp", "public_methods", "to_str", "partition", "tr_s", "empty?", "instance_variable_defined?", "tr!", "gem", "freeze", "equal?", "rstrip", "*", "match", "grep", "chomp!", "+", "next!", "swapcase", "ljust", "to_i", "swapcase!", "respond_to?", "methods", "upto", "between?", "reject", "sum", "hex", "dup", "insert", "reverse!", "chop", "instance_variables", "delete", "dump", "__id__", "tr_s!", "concat", "member?", "object_id", "succ", "find", "eql?", "require", "each_with_index", "strip!", "id", "rjust", "to_f", "send", "singleton_methods", "index", "collect", "oct", "all?", "slice", "taint", "length", "entries", "chomp", "instance_variable_get", "frozen?", "upcase", "sub!", "squeeze", "include?", "instance_of?", "__send__", "upcase!", "crypt", "delete!", "detect", "to_a", "unpack", "zip", "lstrip!", "type", "center", "<", "instance_eval", "protected_methods", "map", "<=>", "rindex", "display", "any?", "==", ">", "split", "===", "strip", "size", "sort", "instance_variable_set", "gsub!", "count", "succ!", "downcase", "min", "extend", "kind_of?", "squeeze!", "downcase!", "intern", ">=", "next", "find_all", "to_s", "<=", "each_line", "each", "rstrip!", "class", "slice!", "hash", "sub", "private_methods", "tainted?", "replace", "inject", "=~", "tr", "reverse", "untaint", "nil?", "sort_by", "lstrip", "to_sym", "capitalize", "max", "chop!", "is_a?", "capitalize!", "scan", "[]"]

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Hashes and Symbols

fred = { :name => “Fred”, :age => 76, :occupation => :janitor } fred[:name] => “Fred” fred[:age] => 76

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Hashes and Symbols

fred = { :name => “Fred”, :age => 76, :occupation => :janitor } fred[:name] => “Fred” fred[:age] => 76 people = [ { :name => “Fred”, :age => 76 }, { :name => “Maggie”, :age => 22 }, { :name => “Laura”, :age => 24 } ] people.size => 3 people[1] => { :name => “Maggie”, :age => 22 }

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Iterators

names = %w(Fred Bert Laura Gus Waldo) names.each { |name| puts name }

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Iterators

names = %w(Fred Bert Laura Gus Waldo) names.each { |name| puts name } Fred Bert Laura Gus Waldo

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Iterators

names = %w(Fred Bert Laura Gus Waldo) names.each do |name| puts name end

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Iterators

1.upto(8) do |i| puts i end

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Iterators

1.upto(8) do |i| puts i end 1 2 3 4 5 6 7 8

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Iterators

[1, 2, 3, 4, 5].map do |number| number * 2 end => [2, 4, 6, 8, 10]

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Iterators

[1, 2, 3, 4, 5].map do |number| number * 2 end => [2, 4, 6, 8, 10] [1, 2, 3, 4, 5].map do |number| number.to_s * 2 end => [“11”, “22”, “33”, “44”, “55”]

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Classes

class Person end

me = Person.new me.class => Person you = Person.new you.class => Person

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Classes

class Person attr_accessor :name, :age end

me = Person.new me.name = “Peter” me.age = 26 fred = Person.new fred.name = “Fred” fred.age = 77 fred.age + me.age => 103

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class Person def year_born=(year) @age = Time.now.year - year end def age return @age end end me = Person.new me.year_born = 1981 me.age => 27

Classes

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Classes

class Person def year_born=(year) @age = Time.now.year - year end def age @age end end me = Person.new me.year_born = 1981 me.age => 27

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Classes

class Person attr_reader :age def year_born=(year) @age = Time.now.year - year end end me = Person.new me.year_born = 1981 me.age => 27

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STOP

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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require 'rubygems' require 'png' def f(x, y) ( (x ^ y) & ((y - 350) >> 3) ) ** 2 end canvas = PNG::Canvas.new(500, 500) 0.upto(499) do |y| 0.upto(499) do |x| if ((f(x, y) >> 12) & 1) == 1 canvas[x, 499 - y] = PNG::Color::Black else canvas[x, 499 - y] = PNG::Color::White end end end png = PNG.new(canvas) png.save 'pattern.png'

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http://www.ruby-lang.org/

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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Events

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Events

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User Groups

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User Groups

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Books

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Books

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Dave Thomas

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Books

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Books

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Books

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Books

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Books

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Books

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Books

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Training

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Training

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Web 2.0 Online Chat Screencasts Blogs

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rubyinside.com

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rubycorner.com

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peepcode.com

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The People

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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RUBY GEMS

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gem install rails

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Installing a Gem

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Using a Gem

require 'rubygems' require 'chronic' Time.now #=> Tue Apr 01 11:30:00 CET 2008 Chronic.parse('tomorrow') #=> Wed Apr 02 12:00:00 +0100 2008 Chronic.parse('last monday') #=> Mon Mar 31 12:00:00 +0100 2008 Chronic.parse('next monday at 5pm') #=> Mon Apr 7 17:00:00 +0100 2008

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Hpricot

doc = Hpricot(

  • pen("http://redhanded.hobix.com/index.html")

) puts doc.search("p").size ( doc / "#sidebar" ).remove puts doc

http://code.whytheluckystiff.net/hpricot

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Gruff

http://nubyonrails.com/pages/gruff

require 'gruff' g = Gruff::Line.new g.title = "My Fruity Graph" g.data("Apples", [1, 2, 3, 4, 4, 3]) g.data("Oranges", [4, 8, 7, 9, 8, 9]) g.data("Peaches", [9, 9, 10, 8, 7, 9]) g.labels = {0 => '2003', 2 => '2005', 4 => '2007'} g.write('my_fruity_graph.png')

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Classifier

require 'classifier' filter = Classifier::Bayes.new(:spam, :ham) filter.train :spam, 'Free viagra!' filter.train :spam, 'Free credit card offer!' filter.train :spam, 'Enhance your anatomy' filter.train :ham, 'URGENT. Your server is down.' filter.train :ham, 'Your Amazon.com Order' filter.train :ham, 'E-mail from mom' filter.classify('Your Play.com Order') # => 'Ham' filter.classify('Free love tonight') # => 'Spam'

http://classifier.rubyforge.org/

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http://classifier.rubyforge.org/

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Libraries

Word stemming Image manipulation 3D graphics 2D graphics Physics Bioinformatics E-mail generation Bayes classification SQL generation Text language detection Language parsing Web application frameworks OS integration HTTP servers Other network daemons Credit card validation Payment gateway integration CAPTCHAs RSS feed processing Caching and memoization Graphing Web crawling Gem generation GUI widget library bridges Report generation Unicode handling Core Ruby improvements Text manipulation Content indexing Search

http://rubyforge.org/

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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Rak

http://rak.rubyforge.org/

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Sup

http://sup.rubyforge.org/

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SwitchPipe

http://switchpipe.org/

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FreeRIDE

http://freeride.rubyforge.org/

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Mondrian IDE

http://www.mondrian-ide.com/

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RubyCocoa

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GitNub

http://github.com/Caged/gitnub/wikis/home

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Captain Ruby

example with the Gosu library

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Captain Ruby

example with the Gosu library

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Chipmunk Physics

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Ogre

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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Rubinius Iron Ruby JRuby MRI

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THE ANECDOTE THE DOWNSIDES THE LANGUAGE THE COMMUNITY THE LIBRARIES THE APPLICATIONS THE IMPLEMENTATIONS THE QUESTIONS

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QUESTIONS?

If you get bored... www.rubyinside.com www.petercooper.co.uk

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THE END

If you get bored... www.rubyinside.com www.petercooper.co.uk