How do I reduce an array in JavaScript?

How do I reduce an array in JavaScript?

You can use the reduce() method to reduce an array to a single value. It takes a callback function and an initial value.

Can you show me an example of using reduce?

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

What if I want to create an object from an array?

You can also use reduce() for that! For example: const obj = arr.reduce((acc, curr) => { acc[curr.id] = curr; return acc; }, {}); This creates an object with keys from the array elements.

Are there any performance considerations when using reduce?

Yes, while reduce() is powerful, for very large arrays, consider performance and readability. Sometimes, a simple loop might be more efficient.