Hello! I have a stream of items much like this: `i...

# getting-started

[Olav Hermansen]

Hello! I have a stream of items much like this: items.stream().filter { it.someStuff.equals(search) }.findFirst().orElseThrow( *insert exception* ) I tried to put UnsupportedOperationException() but get problem with ExceptionSupplier. How should I do this?

[tseisel]

ExceptionSupplier should be a function that takes no arguments and returns a subtype of Exception.
In Kotlin you can express that in 2 different ways :

orElseThrow { UnsupportedOperationException() }

OR

orElseThrow(::UnsupportedOperationException)

The latter is a function reference that is equivalent to

orElseThrow(UnsupportedOperationException::new)

is Java.

[Olav Hermansen]

Thanks!

[Mike]

If you use IntelliJ, it will often show you some simplifications. For example, I would expect it to tell you that filter followed by findFirst can be replaced by find.

[Olav Hermansen]

Yeah, use those simplifications all the time 😄