[ruby-core:115008] [Ruby master Feature#5825] Sweet instance var assignment in the object initializer

Issue #5825 has been updated by matheusrich (Matheus Richard).


Maybe a different proposal, but if the `def initialize(@a, @b)` is ugly, how about a new method similar to `attr_{reader,writter}` like

```rb
class User
  init_with :name, :age

  # or maybe
  attributes :name, :age
end

User.new("Matz", 21)
```

We could even have an option like `keyword_init: true` for keyword args.

On the other hand, a simple alternative is using the new `Data` class, which already provides this nicety:

```rb
User = Data.define(:name, :age)

User.new("matz", 21)

# or

User.new(name: "matz", age: 21)
```

----------------------------------------
Feature #5825: Sweet instance var assignment in the object initializer
https://bugs.ruby-lang.org/issues/5825#change-104875

* Author: goshakkk (Gosha Arinich)
* Status: Assigned
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
I'm very excited about this feature in CoffeeScript, and think it might be a nice-to-have thing in Ruby 2.0.

That's how I think it would look like:

~~~ruby
class Me
  def initialize(@name, @age, @location); end
end
~~~

So we can declare `@variable`s in the initializer method parameters definition to avoid assigning instance variables from method arguments by hand, like:

~~~ruby
class Me
  def initialize(name, age, location)
    @name = name
    @age = age
    @location = location
  end
end
~~~
Want to hear what do you guys think, does that feature worth being included in 2.0?




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