May 2018
Intermediate to advanced
376 pages
9h 22m
English
Content preview from Get Programming with JavaScript Next
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Lesson 33. Observables
After reading lesson 33, you will be able to
- Create your own observables
- Subscribe to observables
- Compose new observables with higher-order combinator functions
- Create your own combinator functions for composing observables
Observables are objects in which you can subscribe to streams of data. Observables are like promises, but whereas a promise only resolves or rejects once, an observable can keep emitting new values indefinitely. If you were to think of promises as an asynchronous datum that you can wrap around setTimeout, observables would be the asynchronous data that you can wrap around setInterval.
Note
In order to use observables today, at the time of this writing, you need to use one of the open ...
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