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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>
 
const testSubject = new Rx.Subject();
//basic scan example, sum over time starting with zero
const basicScan = testSubject
  .startWith(0)
  .scan((acc, curr) => acc + curr);
//log accumulated values
const subscribe = basicScan.subscribe(val => console.log('Accumulated total:', val));
//next values into subject, adding to the current sum
testSubject.next(1); //1
testSubject.next(2); //3
testSubject.next(3); //6
const testSubjectTwo = new Rx.Subject();
//scan example building an object over time
const objectScan = testSubjectTwo.scan((acc, curr) => Object.assign({}, acc, curr), {});
//log accumulated values
const subscribe = objectScan.subscribe(val => console.log('Accumulated object:', val));
//next values into subject, adding properties to object
testSubjectTwo.next({name: 'Joe'}); // {name: 'Joe'}
testSubjectTwo.next({age: 30}); // {name: 'Joe', age: 30}
testSubjectTwo.next({favoriteLanguage: 'JavaScript'}); // {name: 'Joe', age: 30, favoriteLanguage: 'JavaScript'}
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