JSFiddle - React, Tailwind, and code Playground

JavaScript

var nameInfo  = [{name: "Moroni", age: 50},
                 {name: "Tiancum", age: 43},
                 {name: "Jacob", age: 27},
                 {name: "Nephi", age: 29},
                 {name: "Enos", age: 34}];

var newNameInfo  = {name: "Moroni", age: 51};
var name = newNameInfo.name;

var match = _.find(nameInfo, function(item) { return item.name === name })
if (match) {
    match.age = newNameInfo.age;
}

alert(nameInfo[0].age);