Can reduce be used with objects?

Can the reduce method be used with objects in JavaScript?

Yes, the reduce method can be used with arrays of objects, but not directly on objects themselves.

How would I use reduce to sum values in an array of objects?

You can use reduce like this: array.reduce((acc, obj) => acc + obj.value, 0); where value is the property you want to sum.

What if I want to group objects by a property instead?

You can still use reduce for grouping. For example: array.reduce((acc, obj) => { acc[obj.key] = acc[obj.key] || []; acc[obj.key].push(obj); return acc; }, {});.

Can you give me a practical example of this?

Sure! If you have an array of products, you can group them by category using reduce.