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const { interval, of, throwError } = Rx;
const { catchError, concat, endWith, switchMap, take } = RxOperators;

interval(1000)
.pipe(
  take(4),
  switchMap(value => (
    value === 2
    ? (
      throwError('error')
      .pipe(
        catchError(() => of('caughtError')),
      )
    )
    : of(value)
  )),
  concat(of('concatted')),
  endWith('hi'),
)

const { interval, of, throwError } = Rx;
const { catchError, concat, endWith, ignoreElements, switchMap, take } = RxOperators;

interval(1000)
.pipe(
  take(4),
  switchMap(value => (
    value === 2
    ? (
      throwError('error')
      .pipe(
        catchError(() => of('caughtError')),
        ignoreElements(),
      )
    )
    : of(value)
  )),
  concat(of('concatted')),
  endWith('hi'),
)