After over two years heavily using RxJS in Angular for all kids of stuff (I once mapped a 100+ step-long Excel formula with success), the only advice I can give

After over two years heavily using RxJS in Angular for all kids of stuff (I once mapped a 100+ step-long Excel formula with success), the only advice I can give is to make a single pipe for a single purpose, using map() and friends to run data down the pipe and performing the decisive final action in the subscribe, possibily a one-line action. Doing this reduces risk of side effects and help reading the code/debugging. Also you must take in account stuff like back-pressure and multicasting observables, which are as useful as hard to master and maintain correctly. Really once you stop putting subscriptions in subscriptions by using the switchMap or switchMapTo operators, a lot of errors start to become clear and avoided.