JSFiddle - React, Tailwind, and code Playground

JavaScript

var maxSpeed = {car:300, bike:60, motorbike:200, airplane:1000,
    helicopter:400, rocket:8*60*60}
var sortable = [];
for (var vehicle in maxSpeed)
      sortable.push([vehicle, maxSpeed[vehicle]])
sortable.sort(function(a, b) {return a[1] - b[1]});

console.log(maxSpeed);

function toObject(sortable) {
  var rv = {};
  for (var i = 0; i < sortable.length; ++i)
    rv[i] = sortable[i];
  return rv;
}

console.log(toObject(sortable));