text: // this is a comment
  // numeric variables
  var a = 5; // this is also a comment
  var b = 10; 
  var c = 20;
  a++;
  b--;
  c += 10;
  
  // boolean variable
  var x = true;
  var z = false;
  
  // string variables
  var name = prompt("What is your name?");
  var message = "Hello";
  alert(message + name);
  
  /* and
  now everything
  is
  a 
  comment*/