Learn to combine RxJs sequences with super intuitive interactive

Learn to combine RxJs sequences with super intuitive interactive

In this article you'll find dynamic visual explanations for the most popular RxJS combination operators such as mergeMap, forkJoin and others. The article also describes use cases and termination conditions for each operator.

In this article you'll find dynamic visual explanations for the most popular RxJS combination operators such as mergeMap, forkJoin and others. The article also describes use cases and termination conditions for each operator.

When working on a sufficiently complex application you usually have data coming from more than one data source. It can be some multiple external data points like Firebase or several UI widgets interacting with a user. Sequence composition is a technique that enables you to create complex queries across multiple data sources by combing relevant streams into one. RxJs provides a variety of operators that can help you do that and in this article we’ll take a look at the most commonly used.

I’ve even become part time animation specialist to design and create most intuitive data flow diagrams that demonstrate the difference between all the operators. However, the diagrams are embedded as an animated GIF so it takes a while for all of them to load. Please be patient.

In the accompanying code I’ll be using lettable operators so if you’re not familiar with them you can do it here. I’ll also be using a custom stream operator that produces a stream of values asynchronously with the first item delivered synchronously upon subscription.

And here is the legend for the type of diagrams I’ll be using throughout this article:

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Merging multiple sequences concurrently#

The first operator we’ll take a look at is merge. This operator combines a number of observables streams and concurrently emits all values from every given input stream. As values from any combined sequence are produced, those values are emitted as part of the resulting sequence. Such process is often referred to as flattening in documentation.

rxjs combining-observables learn combine interactive python

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