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Dependent typing is at the forefront of much programming language research, not least the DOT calculus being planned for the future of Scala. But what is dependent typing exactly? Why is it important, and what can actually be done with it now? Why should the average Scala developer care?

Dependent typing allows you to prove the correctness of our programs in ways that you couldn’t otherwise do. Complex data structures and algorithms are prone to error-ridden implementations - getting them right is hard. With dependent typing, you can encode invariants in a way the compiler can check for you, easing the burden of implementation and preventing bugs.

Scala already has good support for dependent typing, perhaps more than any other mainstream language. Whilst the syntax is not trivial, learning to use dependent typing techniques is easier than you might think, and it is immediately applicable to many areas.

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