RxSwift: onNext, onCompleted, onError

onNext

• Called by the Observable when it emits an item.
• Takes as a parameter the item emitted by the Observable.
• Calls are referred to as emissions.

onError

• Called to indicate that the Observable has failed to generate the expected data or has encountered an error.
• Observable will terminate.
• No more calls to onNext or onCompleted.
• Takes a parameter an indication of what caused the error.
• Calls are referred to as notifications.

onCompleted

• Called after the Observable has called onNext for a final time (If no errors have occurred).
• Calls are referred to as notifications.

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