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basic (must know (Observable Sequences is everthing (A sequence can emit 3…

- - - - next: add new element
      - error
      - completed
    - - using dispose()
      - DisposeBag (addToDisposeBag)
  - - - PublishSubject: allow subscriber get all events when a subscriber subscribes the subject. Before subscribe, subscriber can not receive any event. It's >< with behaviourSubject
      - BehaviourSubject: all of event of last element
        
        Variable is type of this subject
      - ReplaySubject: allow subscribe N elements from last element
      - AsyncSubject: only notify last element
  - - - top: input stream
      - middle: transform function
      - output stream
  - - - MainScheduler: used on main thread
      - CurrentThreadScheduler: is default
      - SerialDispatchQueueScheduler
      - ConcurrentDispatchQueueScheduler
      - OperationQueueScheduler