replace-item-in-array-with-dynamic-index.js

let array = [
  {name: "Minh", age: 20},
  {name: "Brian", age: 22},
  {name: "Hugo", age: 12},
  {name: "Zelda", age: 56},
  {name: "Simon", age: 7}
];

const nameToFind = "Hugo";
const personToReplace = {name: "Ali", age: 34};

const index = array.findIndex(item => item.name === nameToFind);
Object.assign([], array, { [index]: personToReplace });
//=> [
// {name: "Minh", age: 20}
// {name: "Brian", age: 22}
// {name: "Ali", age: 34} <---------
// {name: "Zelda", age: 56}
// {name: "Simon", age: 7}
//];