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Scala's type system allows you to enforce compile-time constraints on your programs, and to take advantage of these constraints to help reason about your code. Yet you still frequently encounter situations where extracting a value from a map is not guaranteed to succeed, or mapping across a set of cases is not guaranteed to be exhaustive. With dependent types you can make operations like these completely safe by construction, in the process eliminating entire classes of errors, and furthermore you can do this without complicating user code. Through this talk you will discover several simple and intermediate examples using dependent types, and Jon will give you a brief outline of some of the challenges involved in implementing typesafe libraries with dependent types in Scala, but the majority of the talk will be accessible to all Scala users.
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