> For the complete documentation index, see [llms.txt](https://xiaohesong.gitbook.io/today-i-learn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://xiaohesong.gitbook.io/today-i-learn/ruby/self.md).

# self

* `self`在当前的`initialize`中直指当前的实例对象

  ```ruby
  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

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

  类似于`coffee js`的

  ```javascript
  this && @
  ```

  例如:

  \`\`\`ruby 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
```ruby
class A
  @num = 8
  def show
    puts @num
  end
end

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

b = B.new
b.show
````