Can you give me advanced examples of using reduce in JavaScript?

Can you give me advanced examples of using reduce in JavaScript?

Sure! The reduce method can be used for various complex operations. For instance, you can use it to flatten an array of arrays.

Can you show me how to flatten an array using reduce?

Absolutely! Here's an example: const flattened = nestedArray.reduce((acc, curr) => acc.concat(curr), []); This will flatten a nested array.

What about using reduce to count occurrences of items in an array?

Great question! You can do that like this: const count = array.reduce((acc, item) => { acc[item] = (acc[item] || 0) + 1; return acc; }, {}); This will give you an object with counts.

Can reduce be used for more than just arrays?

Yes, reduce can be used with any iterable, including objects. You can convert an object's values to an array and then apply reduce.