Question

I’m looking for method to create Vector and push some values without defining variable Vector. For example:

I have function:

public function bla(data:Vector.<Object>):void { ... }

this function expects Vector as parameter. I can pass parameters this way

var newVector:Vector.<Object> = new Vector.<Object>();
newVector.push("bla1");
newVector.push("bla2");
bla(newVector);

Can I do it in one line in Flex? I’m looking for something like:

bla(new Vector.<Object>().push("bla1").push("bla2"));

I’ve also tried this:

bla(function():Vector.<Object> { var result:Vector.<Object> = new Vector.<Object>(2, true); result.push("bla1"); result.push("bla2"); return result; });

But it complains:

1067: Implicit coercion of a value of type Function to an unrelated type __AS3__.vec:Vector.<Object>...

Thanks

Answer 1

You can’t chain Vector.push() calls as they return uint‘s — the new vector length.
The coercion problem, on the other hand, happens because you are passing a function to the bla function, which expects a Vector.<Object>.

You could fix that easily:

bla((function():Vector.<Object> {
    var result:Vector.<Object> = new Vector.<Object>(2, true);
    result.push("bla1");
    result.push("bla2");
    return result; })()
);

However, there’s already a top level function in AS3 that helps you creating vectors.
The Vector() function expects either an Array or a Vector and returns a Vector. So, for example, you could use:

bla(Vector.<Object>(['bla1', 'bla2']));

Visit the AS3 Reference for more info.

EDIT: I forgot to mention that the fix on the function approach was simply adding a () to it, meaning we actually called the anonymous function and passed it’s return to the bla function.