From: ko1@...
Date: 2017-11-29T06:27:47+00:00
Subject: [ruby-core:83944] [Ruby trunk Feature#8563] Instance variable	arguments

Issue #8563 has been updated by ko1 (Koichi Sasada).


Oops.

```
class Binding
  def set_attributes(attrs = self.eval('method(__method__).parameters.map{|t, v| v}'))
    attrs.each{|attr|
      self.receiver.instance_variable_set(:"@#{attr}", self.local_variable_get(attr))
    }
  end
end

class C
  def initialize a, b
    x = y = nil
    binding.set_attributes
  end
end

p C.new(1, 2) #=> #<C:0x000001f30a8b95d0 @a=1, @b=2>
```


----------------------------------------
Feature #8563: Instance variable arguments
https://bugs.ruby-lang.org/issues/8563#change-68005

* Author: sawa (Tsuyoshi Sawada)
* Status: Rejected
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
----------------------------------------
Often times, people want to assign given arguments to instance variables, especially inside the method `initialize`:

~~~Ruby 
def initialize foo, bar, buz
  @foo, @bar, @buz = foo, bar, buz
  ...
end
~~~

I propose to let method definition take instance variables as arguments so that:

~~~Ruby 
def initialize @foo, @bar, @buz
  ...
end
~~~

would be equivalent as above.




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