What are the advantages of Observable over Promise

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Question -
What are the advantages of Observable over Promise ?

Answer -

An Observable is like a Stream. It enables to pass zero or more events where the callback is called for each event.
Observable is preferred over Promise because it provides the features of Promise and more.
With Observable we can handle a single or multiple events.
Observable also has the advantage over Promise to be cancelable.
Observable allows lazy initialization.
Observable allows to format data
Observable provides operators like map, forEach, reduce etc

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