Zone JS

gistfile1.txt

So what are Zones ????
 >Zones is a new mechanism that helps developers work with [[ multiple logically-connected ]] async operations. 
 >Zones associate each async operation with a zone.
 >A zone is an execution context that persists across async tasks, and allows the creator of the zone
 to observe and control execution of the code within the zone.
 
 Okay , but what could be the advantage of this ?? 
 > We can Associate some [[data]] with zone, which can be accessed by all [[async]] code registered with that Zone 
 > Also It can handle Uncaught Error Or Unhandled REJECTED promises.
 
 **Important
 Let’s do an experiment. Go and take your favorite Angular 2 app, and don’t include zone.js. See what happens, I’ll wait here. 
 Notice anything interesting? None of the bindings are working!
 
 In AngularThe Application subscribes to zone’s [[onTurnDone]] event,
 which, if we do some more digging, calls [[tick]], which actually calls all of the change detectors.
 So, without zones, we don’t get any change detection, so we don’t get any of the nice UI updates that we’d expect!