How to check the length of an Observable array

Question

In my Angular 2 component I have an Observable array

list$: Observable;

In my Template

Answer 1

This is what worked for me -

*ngIf="!photos || photos?.length===0"

I am getting my data from httpClient async.

All the other options here didn't work for me which was disappointing. Especially the sexy (list$ | async) pipe.

Basa..