Observable vs promise

Question

Accepted Answer

Observables are streams of data that can be observed over time, while promises represent a single value that may be resolved in the future.

Observables can emit multiple values over time, while promises can only resolve once with a single value.
Observables can be cancelled, while promises cannot be cancelled once they are resolved.
Observables are lazy, meaning they do not emit values until they have a subscriber, while promises are eager and immediately start executing when created.
Observables are often used for handling events or asynchronous operations that may have multiple values, while promises are typically used for handling a single asynchronous operation.
Example: Observables are commonly used in Angular for handling data streams from HTTP requests, while promises are used in JavaScript for handling asynchronous operations like fetching data from a server.

Top Infosys Team Lead interview questions & answers