What is the difference between array reduce and array map?

What is the difference between array reduce and array map?

Array map creates a new array by applying a function to each element, while reduce transforms an array into a single value.

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

Sure! For map, you might use it to double each number in an array: array.map(x => x * 2). For reduce, to sum numbers: array.reduce((acc, curr) => acc + curr, 0).

When would I use reduce instead of map?

Use reduce when you need to compute a single value from an array, like a sum or an object, while map is for transforming data.

Are there any performance differences between them?

Yes, reduce can be more efficient for certain operations since it processes the array in a single pass, while map creates a new array.