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Rx JS basics
The document provides an overview of RxJS, a declarative programming style based on event emitters, covering functional and reactive programming concepts. It introduces important terminologies like observables, subjects, and operators, and discusses different observable types. The document also includes hands-on examples and explanations of creating and using operators.
Rx JS basics
- 1. RX JS Basics RxJS is a declarative style of programming based on event emitters. - Vinay Prajapati
- 2. We’ll Cover FunctionalProgramming Reactive Programming What is RxJS Important Terminologies Observable types Subject Operators
- 3. Functional Programming DeclarativeVs Imperative Programming Pure functions Higher Order / First class Functions Recursion
- 4. Reactive Programming followsdeclarative programming paradigm Works on data streams
- 5. What is RXJS? Declarative style of programming Supports Functional Programming Event / event stream based Lazy push Based (Observable)
- 6. Important terminologies Observable Observer Subscription Operators (Instance Vs static) Subject Schedulers
- 7.
- 8. Observable Types ColdObservable Hot Observable Warm Observable Unicast / Plain Observable Multicast Observable
- 9. Subject - Whatis a Subject - Observer + Observable at the same time - Examples
- 10.
- 11. Operators What isOperator Creating an Operator Instance vs Static operator Quick review of some operators
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Editor's Notes
- #2 Quote – RX js is Lodash of event.
- #5 While in reactive programming any change in value of b and c will update value of a
- #6 Q – Difference between Pull Vs Push based systems? Promises are push based . May or may not return one value Observables push based. May return 0 to infinite values
- #7 Observers are just objects with three callbacks, one for each type of notification that an Observable may deliver. Next, Error and Complete What is a Subscription? A Subscription is an object that represents a disposable resource, usually the execution of an Observable. Subject – Observable + Observer. Multicasts the value to multiple observers Few examples on same:- Creating Observable Creating an Observer Creating a subscription Closing a subscription Subject Skip schedulers as an excercise
- #8 Observable, Observer, subscription, subscribing & Cancelling a subscription
- #11 Observable, Observer, subscription, subscribing & Cancelling a subscription
- #12 Operators - Operators are methods on the Observable type. When called, they do not change the existing Observable instance. Instead, they return a new Observable, whose subscription logic is based on the first Observable.
- #13 Observable, Observer, subscription, subscribing & Cancelling a subscription
- #14 Observable, Observer, subscription, subscribing & Cancelling a subscription