What is the reduce function in JavaScript?

Can you explain what the reduce function does in JavaScript?

Sure! The reduce function in JavaScript is used to execute a reducer function on each element of an array, resulting in a single output value.

How do I use the reduce function with an array of numbers?

You can use it like this: const sum = numbers.reduce((accumulator, current) => accumulator + current, 0); This sums up all the numbers in the array.

What are some common use cases for the reduce function?

Common use cases include summing values, flattening arrays, counting occurrences of items, and transforming data structures.

Can you give me an example of using reduce to flatten an array?

Absolutely! You can flatten an array like this: const flattened = nestedArray.reduce((acc, curr) => acc.concat(curr), []); This combines all sub-arrays into a single array.