JSFiddle - React, Tailwind, and code Playground

JavaScript

var a = [ { 1: "A"},
          {2: "D"},
          {3: "C"},
          { 4: "B"}];


function sort(arr) {
    arr.sort(function(a,b) {
         var descA = a;
         console.log(a)
    var descB = b;
          return ((descA < descB) ? -1 : ((descA > descB) ? 0 : 1));
    });
    
    return arr;
}

var res = sort(a);

console.log(res);