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ruby-VI(hello class)

Last updated at Posted at 2020-11-25

学習内容

  • class,object

クラス、オブジェクト

  • class

    • クラスとは: 一種のデータ型、「オブジェクト設計図」や「オブジェクトの雛形」とも呼ばれることもある。
    • クラスが同じならば保持している属性や使えるメソッドは(原則として)同じになる。
  • object

    • クラスをもとにして作られたデータのかたまり
    • 同じクラスから作られたオブジェクトは同じ属性、メソッドを持つが、属性に保持されるデータは異なる。

code

require 'colorize'

# method
def hello(name)
  "Hello #{name}."
end

# inherited class
class Hello < String
  def hello
    "Hello #{self}."
  end
end

# extend class
class String
  def hello
    "Hello #{self}."
  end
end

# method call
name = ARGV[0]
puts "method call"
puts hello(name).green

# inherited class call
name = Hello.new(ARGV[0])
puts "inherited class call"
puts name.hello.green

# extend class call, override
puts "extend class call, override"
puts ARGV[0].hello.green

参考

講義ページ

プロを目指す人のための Ruby 入門


  • source ~/classes/muli_scale/grad_members_20f/members/keita_k7/memo/c10.org
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