I'm new to rxjava. I need to combine two observables that emit objects of different type. Something like Observable<Milk> and Observable<Cereals> and get a Observable<CerealsWithMilk>. I couldn't find any operator for something like this. What would be the rx way of doing something like this? Note that Milk and Cereals are async.
It's hard to say without knowing exactly what you need, but possibly zip() or combineLatest().
zip will take both Observable<Milk> and Observable<Cereals> and let you combine them into CerealsWithMilk via a provided function. This emits a new CerealsWithMilk each time you get get both a Milk and a Cereals.
combineLatest is similar to zip except it will emit a new CerealsWithMilk even if just a new Milk or just a new Cereals is emitted.