Is there Scala equivalent of C# "as" keyword?

Question

Is there Scala equivalent of C# as keyword?

var something = obj as MyClass;

Scala's asInstanceOf throws java.lang.ClassCastException:

val something = obj.asInstanceOf[MyClass]

Tunicle

You should post the code that throws a ClassCastException. The object you're trying to cast simply isn't of that type. – Ulterior

possible duplicate: #931963 – Commonable

Answer 1

After reading up on C# a bit, I realized you probably meant this:

val foo = if (bar.isInstaceOf[Foo]) bar.asInstanceOf[Foo] else null.asInstanceOf[Foo]

It should be noted that using null is discouraged in Scala. You should really do this:

val foo = if (bar.isInstaceOf[Foo]) Some(bar.asInstanceOf[Foo]) else None

Ulterior

It should be noted too that casting in discouraged in Scala ;) – Commonable

@Alois: Of course it is, but you can't write something equivalent to C#'s as without it. – Ulterior

Answer 2

You can use pattern matching, like explained here: How do I cast a variable in Scala?

Commonable