Kotlin Context Receivers - How to Use, Why, and Best Practice 

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This video is a long-form tutorial on how to use context receivers, a relatively new feature of the Kotlin language.
We talk about
- why context receivers are useful when we need increased (but locally available) abstractions
- how to allow some functionality for some types and not others
- how to control which scopes grant which functionality
- how to disallow compiler-legal but nonsensical calls
- how to not abuse context receivers and do dependency injection right
- some comparisons with Scala, type classes and a version of a pattern called tagless final
We'll look at the need to add extension methods, then the need to abstract extension methods only for some types and not for others. We will introduce the concept of "receiver" and "dispatch receiver" to understand how we can technically solve the problem of selective abstraction.
To overcome the inherent limtations, we'll use context receivers to
- allow some functions for some types and not others
- control which scopes grant which functions
- disallow compiler-legal but non-sensical calls
- implement "implicit" dependency injection
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