https://github.com/ReactiveX/RxJava/wiki/Operator-Matrix

https://github.com/ReactiveX/RxJava/wiki/Operator-Matrix#under-development

Operators present in some but not other classes (when they make sense there too):

• Completable.concatArrayDelayError
• Completable.blockingSubscribe
• Completable.doOnLifecycle
• Completable.onErrorResumeWith
• Completable.onErrorReturn
• Completable.onErrorReturnItem
• Completable.retryUntil
• Completable.safeSubscribe
• Completable.sequenceEqual
• Completable.startWith (MaybeSource, SingleSource)
• Completable.switchOnNext
• Completable.switchOnNextDelayError
• Completable.toFuture
• Maybe.blockingSubscribe
• Maybe.concatArrayEagerDelayError
• Maybe.concatMapCompletable
• Maybe.concatMapSingle
• Maybe.dematerialize
• Maybe.fromObservable
• Maybe.doOnLifecycle
• Maybe.fromPublisher
• Maybe.safeSubscribe
• Maybe.startWith
• Maybe.timeInterval
• Maybe.timestamp
• Maybe.toFuture
• Maybe.switchOnNext
• Maybe.switchOnNextDelayError
• Single.blockingSubscribe
• Single.concatArrayDelayError
• Single.concatArrayEagerDelayError
• Single.concatDelayError
• Single.concatMap
• Single.concatMapCompletable
• Single.concatMapMaybe
• Single.doOnLifecycle
• Single.fromMaybe
• Single.mergeArray
• Single.mergeArrayDelayError
• Single.ofType
• Single.onErrorComplete
• Single.retryUntil
• Single.safeSubscribe
• Single.sequenceEqual (rename equals)
• Single.startWith
• Single.timeInterval
• Single.timestamp
• Single.switchOnNext
• Single.switchOnNextDelayError
• Flowable.fromAction
• Flowable.fromCompletable
• Flowable.fromMaybe
• Flowable.fromObservable
• Flowable.fromRunnable
• Flowable.fromSingle
• Flowable.onErrorComplete
• Flowable.startWith (MaybeSource, SingleSource, CompletableSource)
• Observable.fromAction
• Observable.fromCompletable
• Observable.fromMaybe
• Observable.fromRunnable
• Observable.fromSingle
• Observable.onErrorComplete
• Observable.startWith (MaybeSource, SingleSource, CompletableSource)