redux reducer update user function

let users = [
{id: 1, name: 'user1', status: 'online'},
{id: 2, name: 'user2', status: 'offline'},
{id: 3, name: 'user3', status: 'invisible'}
]

let updatedUser = {id: 4, name: 'user2', status: 'lalala'}
let index = -1;
let oldItems = users;
let newItems = [];
for (var i = 0; i < oldItems.length; i++) {
  if (oldItems[i].id === updatedUser.id) {
    index = i;
    break;
  }
}
  
  if (index >= 0) {    
  newItems = [...oldItems.slice(0,index), updatedUser,...oldItems.slice(index + 1, oldItems.length)];
  }
  
console.log(newItems);