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How can I prevent a function from being executed multiple times in quick succession?

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How can I prevent a function from being executed multiple times in quick succession?

Asked on Feb 03, 2026

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To prevent a function from being executed multiple times in quick succession, you can use a technique called "debouncing". This involves setting a delay before the function is executed, and if the function is called again during this delay, the timer resets.

<!-- BEGIN COPY / PASTE -->
        function debounce(func, delay) {
            let timeoutId;
            return function(...args) {
                clearTimeout(timeoutId);
                timeoutId = setTimeout(() => func.apply(this, args), delay);
            };
        }

        const myFunction = () => {
            console.log("Function executed!");
        };

        const debouncedFunction = debounce(myFunction, 300);

        // Usage example: attach debouncedFunction to an event
        window.addEventListener('resize', debouncedFunction);
        <!-- END COPY / PASTE -->

Additional Comment:

The "debounce" function takes two arguments: the function to debounce ("func") and the delay in milliseconds ("delay").
The "debouncedFunction" will only execute "myFunction" if 300 milliseconds pass without another call.
This is useful for optimizing performance in scenarios like window resizing or input events.
The "apply" method is used to maintain the correct "this" context and pass arguments.

✅ Answered with JavaScript best practices.

Ask any question about JavaScript here... and get an instant response.

How can I prevent a function from being executed multiple times in quick succession?

Asked on Feb 03, 2026

Answer

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