As we saw in the former section, the catch() operator does a good job of ensuring that a stream that errors out doesn't cause any problems when being merged with another stream. The catch() operator enables us to take the error, investigate it, and create a new Observable that will emit a value as though nothing happened. Sometimes, however, you don't want to even deal with streams that error out. For such a scenario, there is a different operator, called onErrorResumeNext():

// error-handling/error-ignore.js
const Rx = require("rxjs/Rx");

let mergedIgnore$ = Rx.Observable.onErrorResumeNext(
  Rx.Observable.of(1),
  Rx.Observable.throw("err"),
  Rx.Observable.of(2)
);

mergedIgnore$.subscribe(data => console.log("merge ignore", data));

The implication of using the onErrorResumeNext() operator is that the second stream, the one that emits an error, gets completely ignored, and the values 1 and 2 get emitted. This is a very nice operator to use if your scenario is only about caring for the streams that do not error out.