What is the difference between promise and observable?

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Accepted Answer

Below are the list of differences between promise and observable: | Observable | Promise | | | | | Declarative: Computation does not start until subscription, so they can run whenever you need the result | Executes immediately on creation| | Provides multiple values over time | Provides only one | | Subscribe method is used for error handling that facilitates centralized and predictable error handling | Push errors to the child promises | | Provides chaining and subscription to handle complex applications | Uses only .then() clause |

Observable	Promise
Declarative: Computation does not start until subscription, so they can run whenever you need the result	Executes immediately on creation
Provides multiple values over time	Provides only one
Subscribe method is used for error handling that facilitates centralized and predictable error handling	Push errors to the child promises
Provides chaining and subscription to handle complex applications	Uses only `.then()` clause