Higher-order observables

Higher-order Observables = observables of observables.

Operators to handle higher-order observables:

• mergeMap (previously flatMap)
  • Creates new observable immediately.
  • Outer and inner observable emissions not guaranteed to be in same order.
• concatMap
  • Waits for previous observable to complete and then creates new one.
  • Outer and inner observable emissions will be in same order.
• switchMap
  • Unsubscribes from previous inner observable when new inner observable emission is received.
• exhaustMap
  • Ignores any new inner observable emissions while the ongoing one is not complete.

Sources

• Higher-order Observables - RxJS Guide

Related: AngularAngular

Validators should be pure functions. #spaced
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