example of observables

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: rxjs coding example

const button = document.querySelector('button');
const output = document.querySelector('output');

button.addEventListener('click', e => {
  output.textContent = Math.random().toString(36).slice(2);
});