RX getting a IObservable<List<T>> to an IObservable<T>

Question

I'm pretty new to RX and cannot figure this out.

I have an IObservable<List<T>> where List<T> is guaranteed to have one element.

How do I convert this to an IObservable<T>.

I thought it would have something to do with Single but that is listed as obsolete, and also doesn't return an IObservable<T> anyway (as pretty sure it would return the Single List<T> element.

Is there some SelectMany magic I can do here?

Answer 1

You can just do this:

IObservable<List<T>> source;

var converted = source.Select(x => x[0]);

Or if you prefer LINQ query comprehension syntax then equivalent is:

var converted = from x in source select x[0];