From: "cheba (Alexander Mankuta) via ruby-core" <ruby-core@...>
Date: 2025-11-17T18:29:31+00:00
Subject: [ruby-core:123833] [Ruby Bug#21693] Allow calling any callable object as a method

Issue #21693 has been reported by cheba (Alexander Mankuta).

----------------------------------------
Bug #21693: Allow calling any callable object as a method
https://bugs.ruby-lang.org/issues/21693

* Author: cheba (Alexander Mankuta)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Callable objects are popular in Ruby. A very common pattern of Service objects with a single public `call` method can be found in many Rails apps, too.

I propose to extend syntax so that adding `()` to any object that has a `call` method to work as a method invocation.

Example:

```ruby
class Greeter
  def call(name)
    puts "Hello, #{name}!"
  end
end

hello = Greeter.new

hello("World") # => Hello, World!
```

We have a `[]` method in `Proc` that achieves similar effect but it doesn't look like a method call. There's also a dotted syntax `hello.("World")` but it also looks a little awkward and the dot is easy to forget.

It's probably a bit late for Ruby 4, but I though it's a good opportunity to introduce a potentially big change.



-- 
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