Difference between promise and observables

Question

Accepted Answer

Promises are used for a single asynchronous operation, while observables are used for multiple asynchronous operations over time.

Promises are eager, meaning they start immediately upon creation. Observables are lazy, meaning they only start when subscribed to.
Promises can only handle a single value, while observables can handle multiple values over time.
Observables are cancellable, while promises are not.
Observables provide operators like map, filter, and reduce for transforming data streams.
Promises have a .then() method for handling success and error callbacks, while observables have subscribe() method for handling data emissions.

Accepted Answer

Both observables and promises help us work with asynchronous functionality in JavaScript. Promises deal with one asynchronous event at a time, while observables handle a sequence of asynchronous events over a period of time.

Difference between promise and observables

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