RxJs异步操作和javascript promise或async等待之间的区别

Question

This might be the silly one but help me out with the question. I started learning RxJs but I could see RxJs is used for reactive programming where we can subscribe to events and handling multiple events and process in chaining with observables and I got the doubt like what will be the difference between using async/await or promises in javascript because they are also doing the async flow in javascript. Any advantages over async/await.

Answer 1

I suggest you search the web a bit as this will give you a much better answer and views on the difference between asynchronous promise and observable objects

The main difference is that you use promise when you want the code to be done asynchronously and you use observables when you want to be notify when a variable value is being altered (you observe the variable by subscribing to its events)

Answer 2

The main difference: Promise is one-time while Observable is assumed to emit for multiple times.

Events, HTTP streams, interval timers - that all does not fit Promise well. So Observable is more like generators than Promise .

Say we need throttling click with requesting server having some short timeout in case server does not respond in 5 seconds. We can either use event handler wrapped into throttle and then running Promise-based fetch with attaching promisified timeout with Promise.race() .

Or we can use only rxjs to describe complete flow as set of operators.