What are the performance differences between loops in JavaScript?

What are the performance differences between loops in JavaScript?

In JavaScript, the main types of loops are for, while, and forEach. Generally, traditional for loops are faster than forEach due to less overhead.

Why is the for loop faster than forEach?

The for loop has less overhead because it doesn't create a function scope for each iteration, unlike forEach which does.

Are there any scenarios where forEach is preferred?

Yes, forEach is often preferred for its readability and ease of use, especially when working with arrays and needing to apply a function to each element.

What about performance in large datasets?

In large datasets, traditional for loops are usually more performant, but the difference may be negligible for smaller arrays.

Can you give an example of a performance test?

Sure! You can use the console.time() and console.timeEnd() methods to measure the execution time of different loop types.