What are common performance optimizations in JavaScript?

Question

AI Bootstrap Builder · Accepted Answer

Optimizing JavaScript performance involves several strategies to ensure your code runs efficiently and quickly. Here are some common techniques:


        
        // Example of using requestAnimationFrame for animations
        function animate() {
            // Animation logic here
            console.log("Animating...");
            requestAnimationFrame(animate);
        }
        requestAnimationFrame(animate);

        // Example of using event delegation
        document.querySelector("#parent").addEventListener("click", function(event) {
            if (event.target.matches(".child")) {
                console.log("Child element clicked:", event.target);
            }
        });

        // Example of using memoization
        const memoizedFactorial = (function() {
            const cache = {};
            return function factorial(n) {
                if (n in cache) {
                    return cache[n];
                } else {
                    if (n === 0) {
                        cache[n] = 1;
                    } else {
                        cache[n] = n * factorial(n - 1);
                    }
                    return cache[n];
                }
            };
        })();

        console.log(memoizedFactorial(5)); // Outputs: 120

ADDITIONAL COMMENT: - Use "requestAnimationFrame" for animations to ensure they run at the optimal frame rate for the user's display. - Implement event delegation by attaching a single event listener to a parent element to handle events for multiple child elements. - Use memoization to cache the results of expensive function calls and return the cached result when the same inputs occur again. ✅ Answered with JavaScript best practices.

What are common performance optimizations in JavaScript?

Asked on Sep 01, 2024

Answer