What is the difference between reduce and map in JavaScript?

Can you explain the difference between reduce and map in JavaScript?

Sure! Both reduce and map are array methods in JavaScript, but they serve different purposes. Map creates a new array by applying a function to each element, while reduce accumulates a single value from an array.

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

Of course! For map, you might use it like this: const doubled = arr.map(num => num * 2); For reduce, it could look like this: const sum = arr.reduce((acc, num) => acc + num, 0);

When should I use reduce instead of map?

Use reduce when you want 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?

Yes, performance can vary. Map is generally faster for transforming arrays, while reduce can be slower due to its accumulation process, especially with large datasets.