What are the performance differences between various JavaScript iterables?

What are the performance differences between various JavaScript iterables?

JavaScript has several iterable types like Arrays, Sets, and Maps. Each has different performance characteristics depending on the operation.

Can you explain how the performance varies for adding elements?

Sure! Adding elements to an Array is generally O(1) for push operations, while Sets also offer O(1) for add operations. Maps have similar performance for setting key-value pairs.

What about iteration speed? Which is the fastest?

For iteration, Arrays are typically the fastest due to their contiguous memory allocation. Sets and Maps are slightly slower due to their underlying hash table implementations.

Are there any scenarios where one is preferred over the others?

Yes, if you need unique values, use a Set. For key-value pairs, a Map is ideal. Arrays are best for ordered collections.