Hello, when I declare a typealias, am I supposed t...

# announcements

[adolev]

Hello, when I declare a typealias, am I supposed to be able to discriminate between the alias and the aliased type in a when expression?

[Andreas Sinz]

adolev: There is no way to determine whether its the typealias or the type itself. if you have a typealias UserName = String, you can pass a String when a method expects a Username

[Andreas Sinz]

"Type aliases do not introduce new types. They are equivalent to the corresponding underlying types." says the doc

[adolev]

OK, thanks! I was just wondering, if it was the case, how the type information was retained at runtime. This makes it a lot simpler 🙂