What Ruby lacks

• Many years of optimizations and stability
• Unlike Perl, Ruby has no variable declaration. This means there is no local variable scope. The first variable assigment defines its scope.

  def method
      foo = nil
      array.each { |element|
          bar = element
          # element and bar are block local
          foo = element
          # while foo is not
      }
  end

• No bytecode interpreter
• No typed variables (total polymorphism)
• No operators ++ and --   :)
• and much more...

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Ruby and Perl mini comparison

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