GitHub - afiler/safetyblanket: A horrible demonstration of a new Ruby concept

safetyblanket

A horrible demonstration of a new Ruby concept enabled by an innocent-seeming change in Ruby 2.1. Now that def returns the symbol name of the function defined, we can do all sorts of horrible horrible crufty things like add runtime "type safety" (bahahahhahahaha) to Ruby.

Exemplum gratis:

require './safetyblanket'

class Cruft
  extend SafetyBlanket

  int def foo(arg)
    puts arg
    arg
  end
  
  char def first_letter(arg)
    puts arg[0]
    arg[0]
  end
  
  void def null_factory(arg)
    puts arg
    nil
  end
end

cruft = Cruft.new
cruft.foo 37
cruft.null_factory "🏭"
cruft.first_letter "pie"
cruft.foo "monkey"

Will give:

37
ABBA
🏭
p
20
monkey
(eval):10:in `foo': foo returned String instead of Fixnum (RuntimeError)
        from example.rb:59:in `<main>'

Adding more "types" (bahahahhahahaha):

module SafetyBlanket
  require 'set'

  def set(symbol)
    safetyblanketize symbol, Set
  end
  
  def Palindrome(symbol)
    safetyblanketize symbol, String do |str|
      str == str.reverse
    end
  end
end