On: ADT through the looking glass – lenses, prisms and...

[papaf]

But I don’t really understand why you would need such a convoluted system to get/mutate some values in a data structure in Scala.

It allows you to work with deep data structures in a safe immutable way.

Scala is a nice language for working with data, the standard library, techniques such as lenses and ecosystems such as Spark all contribute to this.