gistfile1.groovy

In JavaScript I can do this: (setTimer is just a vertx function which calls the specified handler function at some time (100 ms) in the future.)

var id = vertx.setTimer(100, function() {
    stdout.println("id is " + id);
});

This works because the function is a closure, and id is declared (but not initialised) before setTimer is executed.

But if I try to do the same in Groovy it complains that id is not recognised

def id = Vertx.instance.setTimer(100, {
    println "is is " + id
})

[junit] groovy.lang.MissingPropertyException: No such property: id for class: core.timer.testClient

I can get it to work in Groovy by declaring id on a separate line, but this is pretty ugly:

def id

id = Vertx.instance.setTimer(100, {
    println "is is " + id
})

Just wondering... is this by design? I would expect any local variables declared in the scope before a closure to be accessible in the closure. I understand that id won't be *initialised* before setTimer returns, but does that matter? 

Good answer :)