Operator combineLatest is not the only AND-style combinator. In this lesson we will explore withLatestFrom, another AND-style combination operator, and how it works essentially as map() operator, with some combination properties.
I'm pretty sure I have the exact same code as you do and for some reason I get 'helLo' printed out, so just the second 'L' is set to upper case. Anyone else getting this?
edit: yep, just checked and even copying the code from this class and running it on JS Bin, the result is always 'helLo'. This behavior makes more sense to me anyways.