This code accompanies the RubyConf 2021 talk “Programming with Something”.

It consists of some support files plus a few different evaluators for the encodings from an earlier talk, “Programming with Nothing”:

• Nothing — the original proc encodings
• Something — an AST to represent those proc encodings, and a translator to build ASTs from procs
• Something::Interpreter — an AST interpreter
• Something::RubyVM::Interpreted — a Ruby implementation of the SECD machine which interprets an expression
• Something::NativeVM::Interpreted — a C implementation of the SECD machine which interprets an expression
• Something::RubyVM::Compiled — a Ruby implementation of the SECD machine which compiles an expression to commands in advance
• Something::NativeVM::Compiled — a C implementation of the SECD machine which compiles an expression to commands in advance

To run the tests:

$ make
$ bundle install
$ bundle exec rspec

To run one of the demo FizzBuzz implementations:

$ make
$ bundle exec ruby demo/something_native_vm_compiled.rb

Please see the talk page for more details.