is there one-liner shortcut for `class << self def isogram? # code here end end` ? make sure to include class in ruby

Yes, there is a one-liner shortcut for defining singleton methods in Ruby using the class << self syntax. Here's how you can achieve it:

main.rb
class MyClass
  class << self; define_method(:isogram?) { |arg| puts arg }; end
end
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In the above code, the define_method method is used to define a singleton method isogram? for the class MyClass. This method can now be called directly on the class itself, like MyClass.isogram?("some_arg").

It is important to note that this one-liner syntax is not commonly used due to its reduced readability. It is generally recommended to use the standard class << self syntax for defining singleton methods in order to keep the code more readable and understandable.