From: non.dmitriy@...
Date: 2018-02-20T15:24:23+00:00
Subject: [ruby-core:85698] [Ruby trunk Feature#14498] Class#to_proc

Issue #14498 has been updated by Nondv (Dmitriy Non).


Hanmac (Hans Mackowiak) wrote:
> Duplicate of #4910
> 
> PS: might be a bit more complicated in C,
> but i would like this:
> 
> ~~~ruby
>  proc { |*args, **keyargs| self.new(*args, **keyargs) }
> ~~~
> 
> so it works with keyargs too


Hi!
It's not really a duplicate since there is a different suggestion.

I have written PR in C based on `Hash#to_proc` definition


----------------------------------------
Feature #14498: Class#to_proc
https://bugs.ruby-lang.org/issues/14498#change-70502

* Author: Nondv (Dmitriy Non)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Hello!

I was creating a list of class instances via `some_list.map { |e| SomeClass.new(e) }` and wondered if there's a `Class#to_proc` to make possible doing `some_list.map(&SomeClass)`.
Well, there is not.

Basically, this is what I suggest:

```ruby
class Class
  def to_proc
    proc { |*args| self.new(*args) }
  end
end

class Dog
  attr_reader :name

  def initialize(name)
    @name = name
  end
end

names = %w[Lucky Pluto Balto]
names.map(&Dog) # map names to dogs
```

Here's the pull request:

https://github.com/ruby/ruby/pull/1821



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