From: nobu@...
Date: 2016-10-25T18:54:51+00:00
Subject: [ruby-core:77762] [Ruby trunk Feature#11925] Struct construction	with kwargs

Issue #11925 has been updated by Nobuyoshi Nakada.


Herwin W wrote:
> ~~~ ruby
> irb(main):003:0> MyClass.new_from_kwargs(1, 2, 3, b: 3)
> => #<struct MyClass a=1, b=3, c=3>

Why does `new_from_kwargs` accept other than keyword arguments?

----------------------------------------
Feature #11925: Struct construction with kwargs
https://bugs.ruby-lang.org/issues/11925#change-61068

* Author: Ilya Vorontsov
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
Propose to make Struct subclass constructors which accept keyword arguments. Not sure, if it's reasonable to allow `.new` accept kwargs, so may be should use different method named like `.create`:

```ruby
  Point = Struct.new(:x,:y, :color)
  pt_1 = Point.create(x: 1, y: 2) # => Point<x: 1, y: 2, color: nil>
  pt_2 = Point.create!(x: 1, y: 2) # => ArgumentError, color not specified.
```

It will greatly simplify work with big structures, especially in cases when struct layout changes and for cases when structure can have lots of non-significant values. It also allows simpler ways to use implement default values for struct members.



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