How can I reduce arrays in JavaScript?

How can I reduce arrays in JavaScript?

You can use the reduce() method to reduce an array to a single value by executing a reducer function on each element.

Can you give me an example of using reduce?

Sure! Here's a simple example: const sum = arr.reduce((acc, curr) => acc + curr, 0); This sums all elements in the array.

What if I want to transform the array instead of summing it?

You can still use reduce() for transformation. For example, to create an object from an array: const obj = arr.reduce((acc, curr) => { acc[curr.id] = curr; return acc; }, {});.

Are there any performance considerations when using reduce?

Yes, while reduce() is powerful, for very large arrays, consider using a loop for better performance.