Question

I’ve been trying to setup a simple Serversocket and I would like to have an exception thrown (other than some other stuff ie. setting a var to false) if some error is encountered, it works using an external callback but what about closures?
The Dart editor gives me an error and refuses to run it!

Server(String address,int port,int backlog)
{
    this.s = new ServerSocket(address,port,backlog);
    this.s.onError = (e) => throw new Exception(e);
}

I’ve tried also “throw e” and stuff like that, but as long as “throw” is present the ide won’t run it.

Answer 1

I have had the same problem, Dart seams to be unable to accepts throws in single line closures. You should be able to do:

Server(String address,int port,int backlog)
{
    this.s = new ServerSocket(address,port,backlog);
    this.s.onError = (e) {
       throw new Exception(e);
    };
}

I have not looked in the spec so I don’t know if its intentional or is a bug.