Functional Javascript array methods

I’ve been whipping up a little mock-database unit that has a few access functions but actually stores the data as arrays for a demo project for a post I’m writing. In the process I wrote this gem:

export function dbOrdersAdd(order) {
  const orderCopy = { ...order };
  // since id is a stringified number, finding the max is a bit of a mess
  const maxId = orders.reduce((max, o) => Math.max(max, parseInt(o.id)), 0);
  orderCopy.id = String(maxId + 1);
  orders.push(orderCopy);
  return { ...orderCopy };
}

In the comment I’m claiming the code is a bit of a mess (and from a readability point that’s true) but actually I love the elegance of using the reduce() method here.