1
Thinking Reactively with RxJS Course Intro
3m 1s
2
Use reactive, RxJS based solutions for complex problems
2m 16s
3
Break down a requirement into small problems
2m 37s
4
Pipe events to numbers and maintain a running count using the scan operator
3m 2s
5
Create safe and predictable observable abstractions
2m 5s
6
Maintain shared observable state using the scan and shareReplay operators
4m 4s
7
Use the filter and pairwise operators to determine when to show and hide the spinner
2m 16s
8
Build an observable from a simple english requirement
1m 44s
9
Expose complex reactive code as simple function based APIs
2m 51s
10
Encapsulate complex imperative logic in a simple observable
3m 46s
11
Extend Your Reactive Logic in RxJS using Observable-like Proxies that Delay or Drop Events
3m 23s
12
Use RxJS combineLatest to Only Emit Notifications When Certain Events Have Happened
4m 2s
13
Maintain Self-resetting State in Your Observable Streams using the RxJS scan Operator
7m 24s
14
Build an Event Combo Observable with RxJS
8m 38s
15
Use RxJS exhaustMap to Wait for Open Combos to Finish Before Starting New Ones
2m 33s
16
Simplify Usage of Your Reactive Service by Building an RxJS Operator to Manage It For You
4m 34s
17
Extend Promises by Adding Custom Behavior
4m 16s

Maintain shared observable state using the scan and shareReplay operators

RxJS>=6.5.3

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The scan() is very useful in RxJS. It allows you to maintain a running state over time. In this lesson, we'll look at some of the state types scan can hold: transient or single source of truth, and how we can achieve each of them by combining it with the share operators.

We'll also look at the differences between share() / shareReplay(1) / shareReplay({bufferSize: 1, refCount: true}) and how to avoid memory leaks when using them.

Maintain shared observable state using the scan and shareReplay operators

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Course

Thinking Reactively with RxJS