Ruby 1.9 Introduction

Ruby1.9.1

Ruby1.9.1 Brad Feeley

Ruby1.9.1 Brad Feeley I work at Digitaria

Ruby1.9.1 What is it?

Ruby1.9.1 What is it? “ Ruby 1.9 is a new series of Ruby. It is modern, faster, with clearer syntax, multilingualized, a much improved version of Ruby.

Ruby1.9.1 Faster JRuby

Ruby1.9.1 Faster New virtual machine YARV

Ruby1.9.1 Faster Maybe another presentation? New virtual machine YARV Kernal (native) threads

Ruby1.9.1 Multilingualized a.k.a. m17n

Ruby1.9.1 Multilingualized File Level Encoding

Ruby1.9.1 Multilingualized File Level Encoding # encodeing: utf-8 alias π = Math::PI

Ruby1.9.1 Multilingualized String Level Encoding

Ruby1.9.1 Multilingualized String Level Encoding my_string.encode(“iso-8859-1”)

Ruby1.9.1 Multilingualized IO Level Encoding

Ruby1.9.1 Multilingualized IO Level Encoding f.open(‘file.txt’, ‘r:ascii’) data = f.read data.encoding.name # => ‘US-ASCII’

Ruby1.9.1 Cleaner Syntax

Cleaner Syntax Ruby1.9.1 String No longer Enumerable

Cleaner Syntax Ruby1.9.1 String No longer Enumerable 1.8 String.ancestors => [String, Enumerable, Comparable, Object, Kernel] 1.9 String.ancestors => [String, Comparable, Object, Kernel]

Cleaner Syntax Ruby1.9.1 String No longer Enumerable 1.8 my_string_var.each { |line| puts line } 1.9 my_string_var.each_line { |line| puts line }

Cleaner Syntax Ruby1.9.1 String str = “test” str.clear # => “” “hellonworld”.lines # => [“hellon”, “world”] “hello”.encoding # => “UTF-8” “kitty”.start_with? “cat” # => false “kitty”.end_with? “tty” # => true

Cleaner Syntax Ruby1.9.1 Array

Cleaner Syntax Ruby1.9.1 Array vowels = ['a','e','i', ‘o’, ‘u’] vowels.index{|letter| letter == 'e'} # => 1 a = [1,2,3] a.permutation(2).to_a #=> [[1,2],[1,3],[2,1],[2,3],[3,1],[3,2]] a.combination(2).to_a #=> [[1, 2], [1, 3], [2, 3]] a.to_s # => “[1, 2, 3]” a.pop(2) #=> [2, 3]

Cleaner Syntax Ruby1.9.1 Hash

Cleaner Syntax Ruby1.9.1 Hash New Key Value Syntax

Cleaner Syntax Ruby1.9.1 Hash New Key Value Syntax 1.8 render :action => ‘new’

Cleaner Syntax Ruby1.9.1 Hash New Key Value Syntax 1.8 render :action => ‘new’ 1.9 render action: ‘new’

Cleaner Syntax Ruby1.9.1 Hash Order Preservation h = {:a => 1, :b => 2, :c => 3 } h[:d] = 4 1.8 puts h.inspect => {:4 => d, :a => 1, :b => 2, :c => 3 }

Cleaner Syntax Ruby1.9.1 Hash Order Preservation h = {:a => 1, :b => 2, :c => 3 } h[:d] = 4 1.8 puts h.inspect => {:4 => d, :a => 1, :b => 2, :c => 3 } 1.9 puts h.inspect => {:a => 1, :b => 2, :c => 3, :4 => d }

Cleaner Syntax Ruby1.9.1 Proc

Cleaner Syntax Ruby1.9.1 Proc New Declaration Syntax 1.8 say_hi = lambda { |a| “Hello, #{a}” }

Cleaner Syntax Ruby1.9.1 Proc New Declaration Syntax 1.8 say_hi = lambda { |a| “Hello, #{a}” } 1.9 say_hi = ->(a){ “Hello, #{a}” }

Cleaner Syntax Ruby1.9.1 Proc New Declaration Syntax 1.8 a = lambda { |x, y=1| x * y } #=> ERROR

Cleaner Syntax Ruby1.9.1 Proc New Declaration Syntax 1.8 a = lambda { |x, y=1| x * y } #=> ERROR 1.9 a = ->(x, y=1){ x * y } a = ->(&x){ x.call }

Cleaner Syntax Ruby1.9.1 Proc New Calling Syntax say_hi = lambda { |a| “Hello, #{a}” } 1.8 say_hi.call(‘Quentin’) # => Hello, Quentin

Cleaner Syntax Ruby1.9.1 Proc New Calling Syntax say_hi = lambda { |a| “Hello, #{a}” } 1.8 say_hi.call(‘Quentin’) # => Hello, Quentin 1.9 say_hi.(‘Quentin’) # => Hello, Quentin

Cleaner Syntax Ruby1.9.1 Block Scope n = “Hello, World!” [1,2,3].each do |n| #do something end

Cleaner Syntax Ruby1.9.1 Block Scope n = “Hello, World!” [1,2,3].each do |n| #do something end 1.8 puts n # => 3

Cleaner Syntax Ruby1.9.1 Block Scope n = “Hello, World!” [1,2,3].each do |n| #do something end 1.8 puts n # => 3 1.9 puts n # => “Hello, World!”

Cleaner Syntax Ruby1.9.1 Debugging

Cleaner Syntax Ruby1.9.1 Debugging -w whitespace

Cleaner Syntax Ruby1.9.1 Debugging -w whitespace Method#owner #=> module the method belongs to Method#source_location #=> where the method is defined

Ruby1.9.1 Installation http://gist.github.com/59130 wget ftp://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.1-p0.tar.bz2 tar -xjvf ruby-1.9.1-p0.tar.bz2 cd ruby-1.9.1-p0 ./configure --prefix=/usr --program-suffix=19 --enable-shared make && make install

Ruby1.9.1 Ruby on Rails

Ruby1.9.1 Resources •http://www.google.com

Ruby1.9.1 Questions?

Ruby 1.9 Introduction

by Bradly Feeley

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