Written form to keep for later: https://blog.rockthejvm.com/contravar...

This video is for the Scala programmer who's only been using generics in their basic form: either with collections, or simply attaching a type argument to a class/trait and minding their own business.

I will introduce the concepts of co and contravariance and why they are useful, with a few examples and some rules of thumb to follow, without getting into the academic weeds that otherwise make these concepts seem so obscure and confusing to most programmers.

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