implementing a debounce function in JavaScript

function debounce(func, delay) {
    let timer;
    return function (...args) {
        clearTimeout(timer);
        timer = setTimeout(() => func.apply(this, args), delay);
    };
}        

A debounce function delays the processing of the input until a pause is detected. This is useful in scenarios like search bars where you don’t want to trigger a search with every keystroke, but only after the user has stopped typing for a specified delay

debounce(func, delay): This function accepts two parameters:

func: The function you want to debounce.

delay: The amount of time (in milliseconds) you want to wait before allowing func to be executed again.

Variable Declaration: let timer;: This variable will store the timeout ID returned by setTimeout. It's declared outside the returned function so that it can be accessed and cleared every time the function is invoked.

Returned Function:The debounce function returns an anonymous function that can be executed later. This returned function:Uses the rest operator (...args) to capture any number of arguments passed to it and stores them in the args array.

Clearing the Previous Timer: clearTimeout(timer);: Before setting a new timer, the previous one (if it exists) is cleared using clearTimeout(timer). This prevents the previous func from being executed if another event occurs within the delay period.

Setting a New Timer: timer = setTimeout(() => func.apply(this, args), delay);setTimeout is used to delay the execution of func.

The func.apply(this, args) line ensures that func is called with the correct this context and arguments. This is important if the function relies on the this keyword or needs specific arguments.