kyuden

Fjord Intern Program

怖話の開発と以下のプログラムを一週間毎に行います

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#Mac OS X

コンピューターの基本と開発環境の作り方を学びます。

---

kyuden

hash = Hash.new do |hash, k|
         raise( ArgumentError, "'#{k}' is not todo sub command" )
       end

kyuden

# bad
if hash[:apple] == "mac" || hash[:apple] == "ipad"

# good
if %w( mac ipad ).include? hash[:apple]

kyuden

NOT_YET = 0
DONE    = 1
PENDING = 2

STATUS ={
 "NOT_YET" => NOT_YET,
 "DONE"    => DONE,
 "PENDING" => PENDING
}.freeze

kyuden

def eratosthenes( search_list, prime_list=[] )
  prime_list << search_list.first

  shake!( search_list, prime_list )

  if prime_list.last**2 > search_list.last
    return prime_list + search_list
  end

  eratosthenes( search_list, prime_list )

kyuden

class Test
  def initialize
    @a = Array.new
    @b = Array.new
  end

  def to_s
    "call to_s"
  end
  def inspect

kyuden

class MyClass
  #可変長引数(複数の引数を配列として受け取る)
  def greet( *names, message )
    names.each do |name|
      puts "#{name}、#{message}"
    end
  end
end

name_list = %w(tom akira joy!)

kyuden

Array('a'..'z').join('')

kyuden

 pry -r./config/environment

kyuden

class Object
  def self.yaml_tag url
    Psych.add_tag(url, self)
  end

  # FIXME: rename this to "to_yaml" when syck is removed

  ###
  # call-seq: to_yaml(options = {})
  #