How does the reduce method work in JavaScript?

Can you explain how the reduce method works in JavaScript?

Sure! The reduce method executes a reducer function on each element of the array, resulting in a single output value.

What are some advanced use cases for reduce?

Advanced use cases include flattening arrays, grouping objects, and implementing complex data transformations.

Can you show me an example of flattening an array using reduce?

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

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

You can do that too! For example: const count = array.reduce((acc, item) => { acc[item] = (acc[item] || 0) + 1; return acc; }, {}); This counts occurrences of each item.