Creating Observables

This page shows methods that create Observables.

• just( ) — convert an object or several objects into an Observable that emits that object or those objects
• from( ) — convert an Iterable, a Future, or an Array into an Observable
• repeat( ) — create an Observable that emits a particular item or sequence of items repeatedly
• repeatWhen( ) — create an Observable that emits a particular item or sequence of items repeatedly, depending on the emissions of a second Observable
• create( ) — advanced use only! create an Observable from scratch by means of a function, consider fromAsync instead
• fromEmitter() — create safe, backpressure-enabled, unsubscription-supporting Observable via a function and push events.
• defer( ) — do not create the Observable until a Subscriber subscribes; create a fresh Observable on each subscription
• range( ) — create an Observable that emits a range of sequential integers
• interval( ) — create an Observable that emits a sequence of integers spaced by a given time interval
• timer( ) — create an Observable that emits a single item after a given delay
• empty( ) — create an Observable that emits nothing and then completes
• error( ) — create an Observable that emits nothing and then signals an error
• never( ) — create an Observable that emits nothing at all