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Promises & Observables (Observable (Operators (Combination,…

- - - - .error()
      - .complete()
      - .complete() and .error() will stop outputting new values.
      - .next()
    - - Promises
        
        Observable.fromPromise(promise)
      - Events
        
        Observable.fromEvent(element, 'click')
      - Intervals
        
        Observable.interval(1000)
  - - - Guarantees
        
        Calls to complete and error need to call unsubscription logic.
        
        If your next, complete or error handler throws an exception, you want to call your unsubscription logic so you don’t leak resources.
        
        next, error and complete are all actually optional. You don’t have to handle every value, or errors or completions. You might just want to handle one or two of those things.
        
        Not all methods are required
        
        You don’t want anything called if you’ve unsubscribed.
        
        You don’t want to call next after a complete or an error
    - - Subscribe
- - - - HTTP request is sent immediately and we're waiting for the response to come back
    - - Resolve
      - Reject
      - Error
      - Core
        
        .then()
    - - Pending
      - Fulfilled
      - Rejected