What's the reasoning behind adding the “case” keyword to Scala?

Question

Apart from:

case class A

... case which is quite useful?

Why do we need to use case in match? Wouldn

Answer 1

Adding to @Mik378's answer:

When you write this: (a, b) => something, you are defining an anonymous Function2 - a function that takes two parameters.

When you write this: case (a, b) => something, you are defining an anonymous PartialFunction that takes one parameter and matches it against a pair.

So you need the case keyword to differentiate between these two.