Ruby for Starter

Transcript

1. Ruby Starter eddie@fju

2. None

3. current status

4. 80% iOS app, 20% Ruby/Rails

5. What I want?

6. Problem Solving

7. History

8. まつもと ゆきひろ (Matz)

9. first released at 1995

10. 2.0 released at 2013

11. None

12. Why Ruby? free, open source, easy to learn

13. Ruby != Rails

14. Happy, and Fun

15. Rubies CRuby(MRI), REE, mRuby, JRuby, IronRuby, Rubinius..etc

16. Version 1.8, 1.9, 2.0

17. Ruby 1.8 has no future

18. RVM Ruby Version Manager https://rvm.io/

19. Editors Vim, Emacs, TextMate, Sublime Text... etc

20. git

21. coding style https://github.com/styleguide/ruby

22. Variables and Constants

23. local variable variable

24. global variable $variable

25. instance variable @variable

26. class variable @@variable

27. virtual variable true, false, self, nil

28. variable assignment a = 1 x, y, z = 1,

    2, 3

29. Constant begins with a capital letter, and it can be

    changed

30. Reserved word and Keyword

31. Logic and Flow Control

32. only false and nil are false

33. true v.s. TrueClass false v.s. FalseClass nil v.s. NilClass

34. if..elsif..end

35. unless = if not

36. if modifier

37. case .. when..

38. BEGIN{} and END{}

39. a = true ? 'a' : 'b'

40. a ||= 'a'

41. Comment # single line

42. Comment =begin .. =end

43. Loop and Iteration

44. for.. in..

45. while .. end

46. until .. end

47. until = while not

48. times

49. upto, downto

50. each, each_with_index

51. Block

52. Proc

53. my_square = Proc.new { | x | x ** 2

    } my_square.call(10) # 100 my_square[10] # 100

54. lambda, ->

55. my_lambda = lambda { | x | x ** 2

    } # new style in 1.9 my_lambda = -> x { x ** 2 } # how to call a lambda? my_lambda.call(10) my_lambda[10]

56. Proc v.s. lambda

57. def proc_test puts "hello" my_proc = Proc.new { return 1

    } my_proc.call puts "ruby" end def lambda_test puts "hello" my_lambda = lambda { return 1 } my_lambda.call puts "ruby" end

58. {} v.s. do..end http://blog.eddie.com.tw/2011/06/03/do-end-vs-braces/

59. Number

60. Fixnum and Bignum

61. 10 / 3

62. String http://ruby-doc.org/core-1.9.2/String.html

63. single and double quotes

64. %q v.s. %Q

65. "%s" % "eddie"

66. string interpolation

67. Array http://ruby-doc.org/core-1.9.2/Array.html

68. Array.new v.s. []

69. %w

70. Hash http://ruby-doc.org/core-1.9.2/Hash.html

71. Hash.new v.s {}

72. a = { :name => 'eddie' } a = {

    name: 'eddie' }

73. Range http://ruby-doc.org/core-1.9.2/Range.html

74. (1..10) v.s. (1...10)

75. Methods

76. def method_name(param) ... end

77. parentheses can be omitted

78. ? and !

79. return value

80. Singleton Method

81. class Cat def walk puts "I'm walking" end end cat

    = Cat.new def cat.fly puts "I can fly" end cat.fly

82. Method Missing

83. def method_missing(method_name) puts "method: #{method_name} is called!" end [1, 2,

    3, 4].hello

84. Exception Handling begin .. rescue.. else.. ensure.. end

85. def open_my_file(file_name) File.open file_name do |f| puts f.read end end

    begin open_my_file("block_demo.r") rescue => e puts e else puts "it's working good!" ensure puts "this must be executed, no matter what" end

86. Object-Oriented Programming

87. everything in Ruby is an Object

88. object = state+ behavior

89. top class = Object top class would be BasicObject in

    Ruby 1.9

90. class ClassName < ParentClass ... end

91. Naming Convention

92. initialize

93. ClassName.new

94. self = current object

95. instance and class variable

96. instance and class method

97. public, protected and private method

98. getter and setter

99. attr_reader, attr_writer and attr_accessor

100. Open Class

101. Module

102. module ModuleName ... end

103. module has no inheritance

104. module has no instance

105. Naming Convention

106. require v.s. load

107. Mixin

108. Ruby is single inheritance

109. Duck Typing

110. include v.s. extend

111. Gem

112. gem install PACKAGE_NAME

113. gem env

114. Bundle

115. Gemfile

116. gem "nokogiri", :git => "git://github.com/tenderlove/nokogiri.git" gem "secret_gem", :path => "~/my_secret_path"

117. bundle install

118. pack your own gem!

119. 1. bundle gem NEW_NAME 2. gem build NEW_NAME.gemspec 3. gem

     push NEW_NAME.gem http://docs.rubygems.org/read/chapter/20

120. Rake

121. Ruby Object Model