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Static types are fantastic for ensuring code quality, but rather annoyingly they have to be defined at compile time. What happens when you need to determine the structure of your data at run time, for example when you have to load schemas from a database?

Do you throw away static types and go dynamic? Of course not! You have to change the level of abstraction in our code. In this session you will explore this process, working through a real-life example of switching from domain-specific static types to a composable data description language. How do you keep your code boilerplate-free? How do you maintain correctness? And how do you write expressions that operate on data for which you don't have simple static types? Come along for answers to these questions and more.

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