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I tried to google it, but I cannot find any clear answer for that. From the documentation, I noticed that one is operator, and one is function.

What is the difference between them? and what should I use in my code?

Thanks!

Here is the documentation link:

https://rxjs-dev.firebaseapp.com/api/operators/timeInterval

https://rxjs-dev.firebaseapp.com/api/index/function/interval

interval() is a so called Observable creation method that returns an Observable that emits periodically an ever increasing sequence of numbers with a constant delay between them.

timeInterval() is an operator that basically "timestamps" each emission from its source with time between the two most recent emissions.

The main and probably more obvious difference is how you use them:

range(1, 20).pipe(
  timeInterval(), // `timeInterval()` is an operator
).subscribe(...); // TimeInterval objects
interval(1000).pipe( // `interval()` is a source Observable
).subscribe(...); // 0, 1, 2, ...
        
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