What is Debouncing in JavaScript, and why do we need it?

#webdev #debouncing #programming #javascript

Debouncing is a technique where we delay the execution of a function
until the user stops performing an action.

In simple words:

Wait for the action to stop, then run the function.

Real-life Example (Search Box 🔍)

Imagine you are typing in a search box:

h

he

hel

hell

hello

If the website sends a request after every letter,
that means 5 requests for one word.

This is not efficient:

Too many server requests
Slower performance
Waste of resources

Now imagine this:

The website waits until you stop typing for 1 second,
then sends only one request.

That waiting behavior is called Debouncing.

Why Do We Use Debouncing?

To improve performance
To reduce unnecessary API calls
To prevent repeated execution
To make the application smoother

Simple Code Example

function debounce(func, delay) {
  let timer;

  return function (...args) {
    clearTimeout(timer);

    timer = setTimeout(() => {
      func(...args);
    }, delay);
  };
}
// Example usage
const search = debounce(() => {
  console.log("Searching...");
}, 1000);