JSFiddle - React, Tailwind, and code Playground

JavaScript

var fruit = { 4:"apple", 2:"banana", 3:"grapes" };
var fruitKeys = [ 4, 2, 3 ]
for (var i=0, l=fruitKeys.length; i<l; ++i) {
  var k = fruitKeys[i];
  alert(k + ":" + fruit[k]);
}