[每日见闻-2017-07-20]关于self的小细节

[xiaohesong]

• self在当前的initialize中直指当前的实例对象

class Foo
  def initialize(x)
    self.c x
  end
 
  def c(x)
    puts "c的参数是#{x}"
  end
end
f = Foo.new(1)

• 带给我的感觉
  self在很大程度上类似.都是指定当前的实例.给我的感觉就是

self == @
!self.eql?(@)

类似于coffee js的

this && @

例如:

class Foo
  attr_accessor :name
  def initialize(x)
    @name = "wo"
  end
end

class Foo
  attr_accessor :name
  def initialize(x)
    self.name = "wo"
  end
end

f = Foo.new(3)
puts f.name

再比如

class A
  @num = 8
  def show
    puts @num
  end
end

class B < A
  def initialize
    @num = 3
  end
end

b = B.new
b.show

[xiaohesong]

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