Scala objects are masked as methods versus the actual method (Stream.cons)

Question

I am looking at the Scala Stream API, and I noticed that Stream.cons is implemented as an embedded object. What advantage does this have for implementing it as a function? Under what circumstances should you consider using this technique?

Greetings.

Answer 1

It defines unapply as an object in addition to apply , which allows you to map a template to it.