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Step by Step guide to understanding the Rxjs Library What you'll learn Rxjs Basics Rxjs Subjects Rxjs Operators Rxjs Subscription Understanding Rxjs in more depth Creational, Join, Transformational Operators Error Handling in Rxjs Requirements Knowledge of javascript is important Description RxJS is a library for composing asynchronous and event-based programs by using observable sequences. It provides one core type, the Observable, satellite types (Observer, Schedulers, Subjects) and operators inspired by Array#extras (map, filter, reduce, every, etc) to allow handling asynchronous events as collections.Think of RxJS as Lodash for events.ReactiveX combines the Observer pattern with the Iterator pattern and functional programming with collections to fill the need for an ideal way of managing sequences of events.The essential concepts in RxJS which solve async event management are:Observable: represents the idea of an invokable collection of future values or events.Observer: is a collection of callbacks that knows how to listen to values delivered by the Observable.Subscription: represents the execution of an Observable, is primarily useful for cancelling the execution.Operators: are pure functions that enable a functional programming style of dealing with collections with operations like map, filter, concat, reduce, etc.Subject: is the equivalent to an Eventter, and the only way of multicasting a value or event to multiple Observers.Schedulers: are centralized dispatchers to control concurrency, allowing us to coordinate when computation happens on e.g. setout or requestAnimationFrame or others.Conceptually promises are a subset of observables. Promise is a value that will resolve asynchronously. Most typical example ishttp requests. Observables deal with sequence of asynchronous events. These events could be mouse positions, clicks, user input etc. So one could say observables are richer and more complex abstraction for handling asynchronicity.So, calling observables as promises + helper methods is an oversimplification. The answer to your question depends on whether you need to deal with sequence of events or if you can live with "simple" synchronicity. Overview Section 1: Rxjs Basics Lecture 1 Rxjs Overview Lecture 2 Rxjs setup on Local Machine Lecture 3 Observables Lecture 4 Observers Section 2: Creational Operators Lecture 5 What are Operators Lecture 6 $ajax Operator Lecture 7 bindCallback Lecture 8 RxJs Empty, FromEvent, and Interval Lecture 9 range operator Lecture 10 throwError Section 3: Join Creation Operators Lecture 11 Concat Lecture 12 ForkJoin Lecture 13 Merge and mapTo Lecture 14 Partition Lecture 15 race Section 4: Transformation Operators Lecture 16 buffer Lecture 17 concatMap Lecture 18 map Lecture 19 mergeMap Lecture 20 switchMap Lecture 21 scan Lecture 22 toArray Section 5: Filtering Lecture 23 Filter Lecture 24 Find Lecture 25 take Lecture 26 first Lecture 27 skip Lecture 28 ignoreElements Section 6: Utility Lecture 29 tap Lecture 30 delay Lecture 31 finalize Lecture 32 repeat Section 7: Error Handling Lecture 33 CatchError Lecture 34 retry Section 8: Subscription, Subject and Scheduler Lecture 35 Subscription Lecture 36 Subjects Demo Lecture 37 Async Subject Lecture 38 Behaviour Subject Bner Angular developers who want to learn Rxjs in more depth,javascript/NodeJs developers who want to learn Asynchronous programming pattrern HomePage:
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