Scala objects masked as methods vs actual method (Stream.cons)

Question

I have been going through the Scala Stream collection API and I have noticed that Stream.cons is implemented as an embedded object. What advantage does this have over implementing it as a function? Under what circumstances should one consider using this technique?

Cheers.

Answer 1

作为一个对象，除了apply之外，它还定义了unapply ，它允许你对它进行模式匹配。