Different ways we can create an observable in Angular?
This Article helps you to Understand, How many different ways we can create an observable in Angular?
Observables are like functions with zero arguments that push multiple values to their Observers, either synchronously or asynchronously.
In Angular, observables may be created in a variety of ways., you can utilise the observable Constructor for this. You can build new observables using a variety of operators that are provided. We can generate an observable from an array, string, promise, any iterable, etc. with the use of these operators.
All the creation related operators are part of the RxJs core library. You can import it from the ‘rxjs’ library
One of the simplest approaches is by using create method. Behind the scenes, the create method invokes the observable Constructor. There is no need to import Create because it is a method of the observable object.
val => console.log(val),
There is no difference between the Observable.create method and observable constructor. The Create method calls the constructor behind the scene.
Work same as above
The observable is created by the Of operator from the arguments you supply. The Of operator accepts any number of parameters. The arguments were each emitted in turn, one after the other. In the end, it sends the Complete signal.
From Operator takes only one argument that can be iterated and converts it into an observable.
You can use it to convert
- an Array
- anything that behaves like an array
- any iterable object
- any observable like object
- It converts almost anything that can be iterated to an Observable.
Observable from promise
Use it to convert a Promise to an observable