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Throttling VS Debouncing in Javascript

Some time ago I've written a short article about debouncing in Javascript.

Another term very related to debouncing is throttling. Both techniques do the same thing: they make sure expensive operations (like API calls) are limited in a time interval.

But, in different ways:

  • throttling makes sure that one function is not called more than once in X milliseconds
  • with debouncing we make sure a function is called just once, even if it was invoked multiple times.

A simple implementation for a throttling function may look like this:

function throttle(f, t) {
    return function (args) {
         let previousCall = this.lastCall;
        this.lastCall = Date.now();
            if (previousCall === undefined || (this.lastCall - previousCall) > t) { 
                f(args);
            }
     }
}

You can see in the other tutorial the implementation for the debouncing function.

For example, if we have a user is pressing a button every 500 milliseconds for 6 seconds:

  • with a throttling interval of 2 seconds, the call for the button will take place 3 times.
  • with a debouncing time of 500 milliseconds, then after 6 seconds, the call for the button only takes place just once

Also if you want to read more I have found useful the following links:

šŸ“– 50 Javascript, React and NextJs Projects

Learn by doing with this FREE ebook! Not sure what to build? Dive in with 50 projects with project briefs and wireframes! Choose from 8 project categories and get started right away.

šŸ“– 50 Javascript, React and NextJs Projects

Learn by doing with this FREE ebook! Not sure what to build? Dive in with 50 projects with project briefs and wireframes! Choose from 8 project categories and get started right away.


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