Question

gistfile1.js

// You have an array with links to your backend server
var links = ['http://server.com/link1', 'http://server.com/link2', ...];

// Also you have a simple async function that execute ajax request
// and then execute a callback passing server response as an argument
sendRequest(link, callback(response));

// Write a function that will get data from all the links 
// and then print ONE ARRAY with ALL the server responses to browser's console

function printArray(...) {
  ...
}

// Answer
// ---------------------------------------------------------------------------------
function printArray(links, callback, result) {
  if (typeof result === 'undefined') result = [];
  if (links.length) {
    sendRequest(links.shift(), function(response) {
      result.push(response);
      printArray(links, callback, result)
    });
  }
  else {
    callback(result);
  }
}

printArray(links, function(array) { 
  console.log(array)
});