How is observable different from promise?
|These are used for streams of events over time.||It is able to handle only one event.|
|It supports operators such as map, filter, reduces, etc., and is cancel-able and retry-able.||It is not easy to handle and returns a single value.|
|It provides chaining and subscriptions for handling complex applications.||It uses only the .then() clause.|
|Here the subscribe method is used for a centralized and predictable error handling.||It pushes the errors to the child's promises.|
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