JSFiddle - React, Tailwind, and code Playground

JavaScript

var arr = [];
var users = ["brunofin", "comster404", "ESL_SC2", "OgamingSC2", "cretetion", "freecodecamp", "storbeck", "habathcx", "RobotCaleb", "noobs2ninjas"];

var runRequests = function(userIndex) {
	if (users.length == userIndex) {
  	console.log("runRequests Success", arr);
  	return;
  }
	
  var user = users[userIndex];

  $.ajax({
    url: "/echo/json",
    data: { user: user },
    success: function(data) {
      arr.push({ user: user, index: userIndex, data: data });
      runRequests(++userIndex);
    },
    error: function() {
    	console.error("runRequests Error", arguments);
    }
  });
};

runRequests(0);