I found it it was Bred Victor 2012 talk = https://www.youtube.com/watch?v=PUv66718DII https://www.youtube.com/watch?v=PUv66718DII Laszlo Pandy 205 - implementa

I found it it was Bred Victor 2012 talk = https://www.youtube.com/watch?v=PUv66718DII https://www.youtube.com/watch?v=PUv66718DII Laszlo Pandy 205 - implementation in Elm - Reactor