new Observable code example

Example 1: understanding Observable.create(

import { Observable } from "rxjs/Observable";

var observable = Observable.create(function subscribe(observer) {
    observer.next('Hey guys!')
})

// OR 

var observable = Observable.create((observer:any) => {
    observer.next('Hey guys!')
})

Example 2: emit new value observable

const observable = new BehaviorSubject("initial value");

observable.subscribe({
    next: (value) => console.log("The value is: ", value)
});

observable.next("a new value");

Example 3: create an observabloe js

content_copy
      
      
        open_in_new
      
      function foo() {
  console.log('Hello');
  return 42;
}

const x = foo.call(); // same as foo()
console.log(x);
const y = foo.call(); // same as foo()
console.log(y);