05.04.lesson.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>CPIT405 - JavaScript</title>
</head>
<body>


<script language="JavaScript" type="text/javascript">

  /**
   * Boolean values
   */

  console.log(3 > 2); // true
  console.log(3 < 2); // false
  console.log("Ali" < "Zio"); // true
  console.log("Itchy" != "Scratchy"); // true
  console.log(NaN == NaN); // false, NaN : Not a Number
  console.log(false == 0); // true
  console.log(undefined == null); // true
  console.log(null == 0); // false

  /**
   * Logical operators
   */
  console.log(true && false); // false
  console.log(true && true); // true
  console.log(true || false); // true
  console.log(false || false); // false

  /**
   * Short-circuiting of logical operator
   */
  console.log(null || "user"); // user
  console.log("Someone" || "user"); // Someone

  /**
   * if-else-statement
   */
  var u, a;
  var z = 10,
      k = 29.3,
      p = 9,
      q = 2,
      e = Math.PI;

  if (z > p) {
    u = true;
  } else if (k < e) {
    u = false;
  }

  console.log("u: ", u);

  if (z - q == e || q >= p) {
    a = false;
  } else {
    a = !u;
  }

  console.log("a: " + a);

  /**
   * short if-statement
   */

  var x = 10;
  var y = 20;

  z = (x > y ? "x > y" : "x < y");

  console.log("z = ", z);

  x = Math.random() * 100 > 10 && Math.random() * 100 < 20 ? "Picked two numbers b/w 10 and 20" : "Picked different range!";

  console.log("x: ", x);


  /**
   * switch statement
   */

  x = Math.round(Math.random() * 5);

  switch (x) {
    case 1:
      console.log("x equals one!");
      break;

    case 2:
      console.log("x equals two!");
      break;

    case 5:
      console.log("x equals five!");
      break;

    default:
      console.log("switch default case found x = ", x);
  }

</script>
</body>
</html>