JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="myInput" /><button onclick="printName()">Print Name</button>

JavaScript

var listOfPeople = [{name: 'dave', id: 1}, {name: 'john', id: 2}, {name: 'lisa', id:3}];

function printName() {
    var personId = parseInt(document.getElementById("myInput").value);
    var person = _.find(listOfPeople, {'id': personId});
    alert (person.name);    
}