Re order a list of people and persist it in the person object

reOrder.ts

interface Person {
  order: number;
  name: string;
}

function reOrderPeople(people: Person[], person: Person, newOrder: number) {
  const personIndex: number = people.findIndex((l) => l.name === person.name);

  people.splice(personIndex, 1);
  people.splice(newOrder - 1, 0, person);

  return people.map((person, index) => ({ ...person, order: index + 1 }));
}

const peopleList: Person[] = [
  { order: 1, name: "Nathan Opresnik" },
  { order: 2, name: "John Doe" },
  { order: 3, name: "Alex Jones" }
];

console.log(reOrderPeople(peopleList, { order: 3, name: "Alex Jones" }, 2));
// Result: [
//   { order: 1, name: "Nathan Opresnik" },
//   { order: 2, name: "Alex Jones" },
//   { order: 3, name: "John Doe" }
// ];