Handling requests: a full CRUD API

const products = [
  { id: 1, name: 'Basmati rice 1kg', price: 120, stock: 40 },
  { id: 2, name: 'Toor dal 1kg', price: 160, stock: 25 },
];
let nextId = 3;

function findProduct(id) {
  return products.find((p) => p.id === id);
}

console.log(findProduct(2));  // the toor dal object
console.log(findProduct(99)); // undefined

const items = [{ id: 1, name: 'Sugar 1kg', price: 45 }];
let nextId = 2;

function handle(request) {
  const parts = request.path.split('/').filter(Boolean);
  const id = Number(parts[1]);

  if (request.method === 'GET' && parts.length === 1) {
    return { status: 200, body: items };
  }
  if (request.method === 'POST' && parts.length === 1) {
    const item = { id: nextId++, name: request.body.name, price: request.body.price };
    items.push(item);
    return { status: 201, body: item };
  }
  const index = items.findIndex((p) => p.id === id);
  if (index === -1) return { status: 404, body: { error: 'Product not found' } };
  if (request.method === 'GET') return { status: 200, body: items[index] };
  if (request.method === 'DELETE') {
    items.splice(index, 1);
    return { status: 204, body: null };
  }
  return { status: 405, body: { error: 'Method not allowed' } };
}

console.log(handle({ method: 'POST', path: '/products', body: { name: 'Tea 250g', price: 140 } }));
console.log(handle({ method: 'GET', path: '/products/2' }));
console.log(handle({ method: 'DELETE', path: '/products/2' }).status); // 204
console.log(handle({ method: 'GET', path: '/products/2' }).status);    // 404