In [1]:

    

p "Hello World"


    

    




"Hello World"






    
Out[1]:





"Hello World"

In [31]:

    

# ループの例
[1, 2, 3].each do |t|
  p t
end

[1, 2, 3,].each { |hoge| p hoge }


    

    




1
2
3
1
2
3






    
Out[31]:





[1, 2, 3]

In [8]:

    

class Sample
  def say
    puts 'Hello World!!'
  end
end

sample = Sample.new
sample.say


    

    




Hello World!!

In [9]:

    

puts 'Hello World!!'


    

    




Hello World!!

In [10]:

    

p 1


    

    




1






    
Out[10]:





1

In [12]:

    

p 1.to_s
p true.to_s


    

    




"1"
"true"






    
Out[12]:





"true"

In [16]:

    

p 'hello'.class
p String.ancestors


    

    




String
[String, Comparable, Object, PP::ObjectMixin, Kernel, BasicObject]






    
Out[16]:





[String, Comparable, Object, PP::ObjectMixin, Kernel, BasicObject]

In [21]:

    

p 10.class
p (10000000000000 * 1000000000000).class
p Fixnum.ancestors


    

    




Fixnum
Bignum
[Fixnum, Integer, Numeric, Comparable, Object, PP::ObjectMixin, Kernel, BasicObject]






    
Out[21]:





[Fixnum, Integer, Numeric, Comparable, Object, PP::ObjectMixin, Kernel, BasicObject]

In [24]:

    

p true.class
p TrueClass.ancestors


    

    




TrueClass
[TrueClass, Object, PP::ObjectMixin, Kernel, BasicObject]






    
Out[24]:





[TrueClass, Object, PP::ObjectMixin, Kernel, BasicObject]

In [27]:

    

p nil.class
p NilClass.ancestors


    

    




NilClass
[NilClass, Object, PP::ObjectMixin, Kernel, BasicObject]






    
Out[27]:





[NilClass, Object, PP::ObjectMixin, Kernel, BasicObject]

In [28]:

    

# encoding:utf-8 ← 2.0から省略可能
p 'こんにちは'


    

    




"こんにちは"






    
Out[28]:





"こんにちは"

In [ ]:

    

# キャメル記法
class SampleMethod
  def insertCustomer
    p "test"
  end
end

# スネイル(スネーク)記法
class Sample_method
  def insert_customer
    p "test"
  end
end

# Ruby
class SampleMethod
  def insert_customer
    p "test"
  end
end

# Java
def isHappy
  true
end

# Ruby
def happy?
  true
end