javascript - RxJS Interval without delay

The following code emits an int after 5000ms and then another in every 5000ms later:

let evens = Observable.interval(5000)
     .map(i => {
          return i * 2;
      });

 evens.subscribe((i) => {
      console.log(i);
 });

Is it possible to do this, but have the first result immediately (0ms), and then wait 5000ms between subsequent results?

The following code emits an int after 5000ms and then another in every 5000ms later:

let evens = Observable.interval(5000)
     .map(i => {
          return i * 2;
      });

 evens.subscribe((i) => {
      console.log(i);
 });

Is it possible to do this, but have the first result immediately (0ms), and then wait 5000ms between subsequent results?

Share Improve this question edited Mar 7, 2017 at 11:56 martin 96.9k26 gold badges203 silver badges235 bronze badges asked Mar 7, 2017 at 11:49 gunwin 4,8325 gold badges39 silver badges59 bronze badges

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1 Answer 1

Sorted by: Reset to default 18

You can use timer() where the first parameter is the initial delay:

timer(0, 5000);

Or if you want the first item to be emitted immediately you can also use the startWith() operator.

Jan 2019: Updated for RxJS 6

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javascript - RxJS Interval without delay - Stack Overflow

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