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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>bufferCount</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.3/dist/global/Rx.umd.js"></script>
</head>
<body>
</body>
</html>
 
//emit 1,2,3
const source = Rx.Observable.of(1,2,3);
//start with 0
const example =  source.startWith(0);
//output: 0,1,2,3
const subscribe = example.subscribe(val => console.log(val));
//emit ('World!', 'Goodbye', 'World!')
const sourceTwo = Rx.Observable.of('World!', 'Goodbye', 'World!');
//start with 'Hello', concat current string to previous
const exampleTwo = sourceTwo
  .startWith('Hello')
  .scan((acc, curr) => `${acc} ${curr}`);
/*
  output:
  "Hello"
  "Hello World!"
  "Hello World! Goodbye"
  "Hello World! Goodbye World!"
*/
const subscribeTwo = exampleTwo.subscribe(val => console.log(val));
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