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RxJS debounce vs throttle vs audit vs sample — Difference You Should Know

kosich profile image Kostia Palchyk Updated on ・2 min read

In this article, we'll review how these operators work and how they differ.

For simplicity, we'll compare their *Time counterparts: auditTime, debounceTime, throttleTime, sampleTime — they work in the same way, just in defined time windows.

These operators are handy when you want to lower the load on the consumption function side. For example, you don't want to react to every user mousemove or every input.change event. In their own way, they will let you filter input stream based on time intervals. So let's see how they differ!

We'll start with investigating this marble diagram:

debounceTime vs throttleTime vs auditTime vs sampleTime

You can play with this
marble diagram here

Explanation: here we apply all four operators to the source stream. The source starts emitting at time:0 and completes at time:1000. In the applied operators the colors are preserved from the source, but the value is substituted with the actual time of emission in resulting stream.

As you can see:

  • debounceTime will emit a value from the source stream only if a given time has passed without source producing more values

  • throttleTime will start a timer when the source emits. It can be set to emit the first and/or the last value in the given time window. Then it repeats this procedure

  • auditTime behaves in a similar way to the trailing throttleTime, but note that it won't emit a value from the last time window if the source has completed

  • sampleTime simply emits a value from the source in a given time window if the source actually emitted

I believe in learning by playing, so head to this marble diagram REPL to try changing code yourself: thinkrx.io/rxjs/debounceTime-vs-throttleTime-vs-auditTime-vs-sampleTime

That's it! Please, add a comment if you've learned something new!

Also, check out my RxJS-based framework:

And my declarative Rx endeavors:

I'm planning to share more comparisons and reviews on RxJS.

If you are interested — Follow me here and on twitter!

See you next time

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