What are the memory usage differences between map and foreach in JavaScript?

What are the memory usage differences between map and foreach in JavaScript?

The map method creates a new array by applying a function to each element, which can use more memory. In contrast, forEach executes a function on each element without creating a new array, generally using less memory.

Can you give an example of when to use each?

Sure! Use map when you need to transform data and return a new array. Use forEach when you want to perform an action on each element without needing a new array.

Are there performance implications to consider?

Yes, map can be slower for large datasets due to the creation of a new array. If you don't need a new array, forEach is more efficient.

What about their impact on readability?

map can make your code more declarative and easier to understand when transforming data, while forEach is straightforward for side effects.