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Observables & RxJS (The RxJS Library (Observable creation (from (Array…

- - - - Broadcasting to multiple subscribers in a single execution
      - Observable has to manage the list of subscribers and notify each of them of new events
  - - - next
        
        Required
        
        Forwards values to the stream
      - error
        
        Optional
        
        Finishes execution
      - complete
        
        Delayed values continue to be delivered to the next handler
        
        Optional
- - - - Array
      - Promise
      - Collection
      - String
    - - Interval (in milliseconds)
    - - Element and event name
    - - ajax.getJSON()
      - URL
      - Request object
    - - ...values
  - - - Multiple operators can be linked using pipes
      - pipe() is available as a standalone function and as a method of the observable type
      - A set of operators applied to an observable
  - - - Recover gracefully if an error occurs
      - Returns a new observable
    - - Retry count