Rxjs introduced in the Notification

timer (0, 1000) // timer, a value of each emitting 1000ms, the delay time of the initial transmission values 0s; 
  .pipe ( 
    Take (. 5), // take the first 5 values 
    takeWhile (value => value> -1 ) // long as one is not greater than 1; i.e. Complete execution; end Next 
    Materialize () // specific, each value is converted to a Notification object 
  ) 
  .subscribe ({ 
    Next (value) { 
      the console.log (value ); 
    } 
  }); 
results are as follows:

  --------------------------------------------------------------------------------------------------------------

• materializeIt is to Observable弹射convert the data into an event Notificationobject / subject;
• dematerializeIt is Notification物件/对象converted to Observablethe event information.

-------------------------------------------------------------------------

timer (0, 1000) // timer, a value of each emitting 1000ms, the delay time of the initial transmission values 0s; 
  .pipe ( 
    Take (. 5), // take the first 5 values 
    takeWhile (value => value> -1 ) // long as one is not greater than 1; i.e. Complete execution; end Next 
    materialize () // specific, each value is converted to a Notification objects 
   dematerialize (), with the opposite // materialize operation; Notification objects into the Object of Observable
   ) 
  .subscribe ({ 
    Next (value) { 
      the console.log (value); 
    } 
  });

Results are as follows:

of(1, 2, 3, 'a', 4)
  .pipe(
    materialize(),
    map(x => x.kind === NotificationKind.COMPLETE ? x : new Notification(x.kind, x.value + ' hello'))
  )
  .subscribe(value => {
    console.log(value);
  });

Through the above example, we know a Notificationleast contains several information

1. kind: Current status information: N (Next), E (Error), C (Complete)
2. value: Value / data
3. hasValue: Is there include data
4. error: Error message

Also can be used as new Notification()the way of the establishment.