Object oriented development turns 50 this year. During that time, hundreds of OO languages have come and gone. And yet, with the exception of Smalltalk and a few research languages, none of them were actually object-oriented.

I think we might now be seeing a revival of the spirit of OO, but it is coming from the functional world. I want to show you how to write OO in Elixir, and how liberating this can be.

Object oriented development turns 50 this year. During that time, hundreds of OO languages have come and gone. And yet, with the exception of Smalltalk and a few research languages, none of them were actually object-oriented.

I think we might now be seeing a revival of the spirit of OO, but it is coming from the functional world. I want to show you how to write OO in Elixir, and how liberating this can be.

In 2002, Secretary of Defense Donald Rumsfeld introduced us to the concepts of known knowns, known unknowns, and unknown unknowns. But he left out Unknown Knowns, things that we know without knowing it. And it turns out that these Unknown Knowns are actually the biggest category of knowledge - tacit knowledge.

As developers, we work with knowledge: knowledge of the problem domain, knowledge of our tools, knowledge of our techniques, and knowledge of each other. So getting good at accumulating tacit knowledge is important.

This talk will look at how we are poorly served by most of the current ways we are taught to be better developers. Can we do better? Only if we stop talking and start showing. Let's see why.