What is the difference between Promises and Observables?

Question

What is the difference between Promise and Observable in Angular?

An example on each would be helpful in understanding both the cases. In w

Answer 1

Promise:

• Provide a single future value;
• Not lazy;
• Not cancellable;

Observable:

• Emits multiple values over time;
• Lazy;
• Cancellable;
• Supports map, filter, reduce and similar operators

You can use promises instead of observables when calling HTTP in Angular if you wish.