What are the performance differences between map and filter in JavaScript?

What are the performance differences between map and filter in JavaScript?

The map method creates a new array by applying a function to each element of the original array, while filter creates a new array with elements that pass a test. Generally, map is faster because it processes each element once, whereas filter may require additional checks.

Can you give me an example of when to use each?

Sure! Use map when you want to transform data, like converting an array of numbers to their squares. Use filter when you want to select specific items, like getting all even numbers from an array.

Does the size of the array affect their performance?

Yes, larger arrays can impact performance. Both methods will take longer with larger datasets, but map typically remains faster since it only processes each element once.

Are there any alternatives to these methods?

Yes, you can use forEach for iteration without creating a new array, or reduce for more complex transformations. However, they serve different purposes compared to map and filter.