Updating element in array

update-array.js

const arr = [
  { id: 0, name: 'john'},
  { id: 1, name: 'mark' },
  { id: 2, name: 'luke' },
  { id: 3, name: 'peter' },
];

const newPerson = {id: 2, name: 'newPerson'};
const index = arr.findIndex(val => val.id === newPerson.id);
console.log(index);

const slice1 = [...arr.slice(0, index)];
console.log(slice1);

const slice2 = [...arr.slice(index + 1)];
console.log(slice2);

const newArr = [
  ...arr.slice(0, index),
  newPerson,
  ...arr.slice(index + 1)
];

console.log(arr);
console.log(newArr);