What is the difference between reduce and map in JavaScript?

What is the difference between reduce and map in JavaScript?

The map function creates a new array by applying a function to each element of the original array, while reduce processes the array to produce a single value.

Can you give me an example of how to use both functions?

Sure! For map, you might use it to double each number in an array: const doubled = arr.map(num => num * 2);. For reduce, you could sum all numbers: const total = arr.reduce((acc, num) => acc + num, 0);.

When should I use reduce instead of map?

Use reduce when you need to derive a single value from an array, like a sum or an object. Use map when you want to transform each element into a new array.

Are there any performance differences between them?

Generally, map and reduce have similar performance, but reduce can be more complex and may require more processing time depending on the operation.