SnapshotSubject

Collection of RXJS Utilities

SnapshotReplaySubject

RX JS Subject keep tracks of objects based on keys New Subscriber will get snapshot of accumulated messages and then updates

In Financial Market data applications e.g. we want to display market data based on some key

const sub = new SnapShotReplaySubject<any>((value) => {return value.key});

sub.next({key:'IBM', bid:100, ask:101});

sub.next({key:'IBM', bid:102, ask:104});

sub.subscribe((val) => { console.log(value); } ); }

will display only

{key:'IBM', bid:102, ask:104}