ignoreElements

signature: ignoreElements(): Observable

Ignore everything but complete and error.

Examples

Example 1: Ignore all elements from source

( jsBin | jsFiddle )

//emit value every 100ms
const source = Rx.Observable.interval(100);
//ignore everything but complete
const example = source
  .take(5)
  .ignoreElements();
//output: "COMPLETE!"
const subscribe = example.subscribe(
  val => console.log(`NEXT: ${val}`),
  val => console.log(`ERROR: ${val}`),
  () => console.log('COMPLETE!')
);
Example 2: Only displaying error

( jsBin | jsFiddle )

//emit value every 100ms
const source = Rx.Observable.interval(100);
//ignore everything but error
const error = source
  .flatMap(val => {
    if(val === 4){
      return Rx.Observable.throw(`ERROR AT ${val}`);
    }
    return Rx.Observable.of(val);
  })
  .ignoreElements();
//output: "ERROR: ERROR AT 4"
const subscribe = error.subscribe(
  val => console.log(`NEXT: ${val}`),
  val => console.log(`ERROR: ${val}`),
  () => console.log('SECOND COMPLETE!')
);

Additional Resources


:file_folder: Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/operator/ignoreElements.ts

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