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

Yes, there is a one-liner shortcut for defining a class method in Ruby using metaprogramming techniques. Here's the equivalent one-liner for the class << self def isogram? # code here end end code:

main.rb
class << self; def isogram?; # code here; end; end
51 chars
2 lines

This one-liner uses the "class << self" syntax to switch into the eigenclass (also known as singleton class or metaclass) of the current object, which is the class itself in this case. Then, the method isogram? is defined using the regular method definition syntax (def) within a semicolon-separated block. The semicolons allow the entire definition to fit into a single line.

Note that this technique allows you to define multiple class methods in one block, separated by semicolons, if desired.