1. Sing!

   var numBottles = prompt("How many bottles of beer on the wall?");
   
   var bottles = "bottles"
   while (numBottles > 0){
      console.log(numBottles + " " + bottles + " of beer on the wall,");
      console.log(numBottles + " " +  bottles + " of beer");
      console.log("Take one down and pass it around,");
      numBottles = numBottles - 1;
      if (numBottles === 1){
          bottles = "bottle"
      }
      if (numBottles === 0){
          console.log("No more bottles of beer on the wall!");
      } else {
          console.log(numBottles + " " + bottles + " of beer on the wall!");
      }
   }
   

2. Login

   var userLogin = {userName: "octocat_rules", password: "abacadabra"}
   
   var password;
   
   for (var i=0; i < 3; i++){
      password = prompt("Enter password for user " + userLogin["userName"] + ".")
      if (password === userLogin["password"]){
          console.log("Passwords match!");
          break;
      } else {
          console.log("Passwords do not match!");
          if (i===2){
              alert("No more password attempts!");
          }
      }
   }
   

3. Security Questions ```js var securityQuestions = [ {

      question: "What was your first pet's name?",
      expectedAnswer: "FlufferNutter"
   

   }, {

      question: "What was the model year of your first car?",
      expectedAnswer: "1985"
   

   }, {

      question: "What city were you born in?",
      expectedAnswer: "NYC"
   

   } ]

var thisAnswer = ""; for (var i=0; i < securityQuestions.length; i++){ thisAnswer = prompt(securityQuestions[i]["question"]); if (thisAnswer !== securityQuestions[i].expectedAnswer){ alert("Incorrect security question response!"); break; } }

1. Signup (Bonus)
  ```js
  // Here are some email addresses we want to allow:
  //     [email protected]
  //     [email protected]
  //     [email protected]

  // Here are some email addressed we don't want to allow:
  //     @@@@@
  //     email
  //     [email protected]'t_spam_me

  // Based on these, let's say the basic pattern for an email is:
  //     - some letters or digits, and possibly a few dots (.)s
  //     - an @ (only one of these in the email address)
  //     - some more letters or digits,
  //     - a final dot,
  //     - and 2-3 more letters that might be ly, com, co, and so on.


  var email = prompt("Enter your email address!");

  /* With regular expressions, we can accopmlish this with very little code! */
  pattern = /^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-z]{2,3}$/
  matches = email.match(pattern)
  if (matches != null){
      console.log("regex test: email okay");
  } else {
      console.log("regex test: invalid email");
  }

  /***********************/

  // get the password from the user and save it as a variable
  var password = prompt("Enter your password!");

  // store all the problems with the password in an array
  var problems = [];

  // a strong password should be at least 8 characters long!
  if (password.length < 8){
      problems.push("Password must be at least 8 characters long!");
  }

  // let's also say it should have at least one lowercase letter
  if (password.search(/[a-z]/) === -1){
      problems.push("Password must contain at least one lowercase letter.");
  }

  // ... and one uppercase
  if (password.search(/[A-Z]/) === -1){
      problems.push("Password must contain at least one uppercase letter.");
  }

  // ... and one number
  if (password.search(/[0-9]/) === -1){
      problems.push("Password must contain at least one number.");
  }

  // Check if there were any problems with the password
  if (problems.length !== 0){
      // log each of the problems
      for (var i=0; i<problems.length; i++){
          console.log(problems[i]);
      }
  } else {
      console.log("nice password!");
  }