What are the differences between iterators and loops in JavaScript?

What are the differences between iterators and loops in JavaScript?

In JavaScript, loops are control structures that repeat a block of code, while iterators are objects that allow you to traverse through a collection, like arrays or maps.

Can you give me an example of a loop and an iterator?

Sure! A for loop iterates over an array like this: for (let i = 0; i < arr.length; i++) { console.log(arr[i]); }. An iterator can be used like this: const iterator = arr[Symbol.iterator](); let result = iterator.next(); while (!result.done) { console.log(result.value); result = iterator.next(); }.

When should I use an iterator instead of a loop?

Use iterators when you need to maintain state or when working with complex data structures. They provide more flexibility and can be more readable in certain contexts.

Are there performance differences between them?

Generally, loops are faster for simple iterations, but iterators can be more efficient in terms of memory usage and readability for complex data structures.