My solution of final challenge (with more clean code). Feel free to add any feedback or thoughts to improve it.

So, a few comments...

First, the variable name HTMLMessage isn't so good, since the convention/standard is to only use variable names beginning with capitals for classes of objects. Stick to camelCase:

var htmlMessage = "";
// or even without the HTML part, since it can have the same name as the parameter in the print function
var message = "";

Second, you could be limiting the results returned (if this were a bigger dataset) by using the capitalize function to compare the user's input to the names. You could instead make both the user input and the name being compared lower case, just within the conditional (it won't change the actual value of the variable):

// remove the '.toLowerCase' from the variable
  var userInput = prompt("Please enter a student's name.");
// ...
  for (var i = 0; i < students.length; i++) {
      if (userInput.toLowerCase() === students[i].name.toLowerCase()) {
        foundStudent.push(students[i]);
      }
    }

Third, you're not telling the user how they can quit with the prompt, so unless they view your code first, they wouldn't know.

  var userInput = prompt("Please enter a student's name or type 'quit' to stop.").toLowerCase();

Fourth, if the user hits OK without entering anything, they will see the message: Student with the name not found. printed in the HTML. You might want to instead check for an empty string and handle that case. For example, you could just continue the loop (show the prompt again):

// at the top of the while loop, after showing the prompt:
if (userInput === "") {
  continue;
}

Fifth, if the user hits ESC on their keyboard or presses the Cancel button, you get an error in the console, because userInput will be equal to null. You might want to set userInput to quit in that case so the while loop finishes, and perhaps print a helpful/nice message for the user:

// at the top of the while loop, after showing the prompt, probably before checking for an empty string or anything else:
if (userInput === null) {
  print("Goodbye!");
  userInput = "quit";
  continue;
}

You could alternatively change the while loop to be an infinite one, but check to see if the user cancelled or typed 'quit' from within the loop and break from the loop:

while (true) {
  var userInput = prompt("Please enter a student's name or type 'quit' to stop.");
  if (userInput === null || userInput.toLowerCase() === "quit") {
    print("Goodbye!");
    break;
  }

Here's a JS Bin of the code with my suggestions/modifications: http://jsbin.com/jifaro/1/edit?html,js,console,output

Iain Simmons First of all thank you very much for taking the time to see my code and make additional comments. Everything that you said are extremely helpful. Some things i want to mention. On your first comment about the HtmlMessage, yeah i don't know why i left it as it is, probably i forgot it, the thing is that i get the rule of CameCase so this is not an excuse. Next, sure i could add the condition for the empty string by continuing the loop, i didn't cause i just want stick to the exercise, i mean, you could whatever you want right? the sky is the limit! And sure i could add a condition for the esc button to print a Goodbye message as you very well did. i totally missed that part. Thanks again for your feedback, i really appreciate that you seperate the code in small sections and analyze them seperately.