First Draft

First Draft of the Example Files

15/01.html

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+<script>
+  document.write("a: " + (42 > 3) + "<br>")
+  document.write("b: " + (91 < 4) + "<br>")
+  document.write("c: " + (8 == 2) + "<br>")
+  document.write("d: " + (4 < 17) + "<br>")
+</script>

15/02.html

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+<script>
+  myname = "Peter"
+  myage  = 24
+  document.write("a: " + 42     + "<br>") // Numeric literal
+  document.write("b: " + "Hi"   + "<br>") // String literal
+  document.write("c: " + true   + "<br>") // Constant literal
+  document.write("d: " + myname + "<br>") // String variable
+  document.write("e: " + myage  + "<br>") // Numeric variable
+</script>

15/03.html

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+<script>
+  days_to_new_year = 366 - day_number;
+  if (days_to_new_year < 30) document.write("It's nearly New Year")
+</script>

15/04.html

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+<script>
+  month = "July"
+  if (month == "October") document.write("It's the fall")
+</script>

15/05.html

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+<script>
+  a = 1000
+  b = "1000"
+  if (a == b)  document.write("1")
+  if (a === b) document.write("2")
+</script>

15/06.html

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+<script>
+  a = 7; b = 11
+  if (a > b)  document.write("a is greater than b<br>")
+  if (a < b)  document.write("a is less than b<br>")
+  if (a >= b) document.write("a is greater than or equal to b<br>")
+  if (a <= b) document.write("a is less than or equal to b<br>")
+</script>

15/07.html

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+<script>
+  a = 1; b = 0
+  document.write((a && b) + "<br>")
+  document.write((a || b) + "<br>")
+  document.write((  !b  ) + "<br>")
+</script>

15/08.html

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+<script>
+  if (finished == 1 || getnext() == 1) done = 1
+</script>

15/09.html

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+<script>
+  gn = getnext()
+  if (finished == 1 OR gn == 1) done = 1;
+</script>

15/10.html

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+<script>
+  string = "The quick brown fox jumps over the lazy dog"
+
+  with (string)
+  {
+    document.write("The string is " + length + " characters<br>")
+    document.write("In upper case it's: " + toUpperCase())
+  }
+</script>

15/11.html

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+<script>
+  onerror = errorHandler
+  document.writ("Welcome to this website") // Deliberate error
+
+  function errorHandler(message, url, line)
+  {
+    out  = "Sorry, an error was encountered.\n\n";
+    out += "Error: " + message + "\n";
+    out += "URL: "   + url     + "\n";
+    out += "Line: "  + line    + "\n\n";
+    out += "Click OK to continue.\n\n";
+    alert(out);
+    return true;
+  }
+</script>

15/12.html

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+<script>
+  try
+  {
+    request = new XMLHTTPRequest()
+  }
+  catch(err)
+  {
+    // Use a different method to create an XML HTTP Request object
+  }
+</script>

15/13.html

@@ -0,0 +1,7 @@
+<script>
+  if      (page == "Home")  document.write("You selected Home")
+  else if (page == "About") document.write("You selected About")
+  else if (page == "News")  document.write("You selected News")
+  else if (page == "Login") document.write("You selected Login")
+  else if (page == "Links") document.write("You selected Links")
+</script>

15/14.html

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+<script>
+  switch (page)
+  {
+    case "Home":
+      document.write("You selected Home")
+      break
+    case "About":
+      document.write("You selected About")
+      break
+    case "News":
+      document.write("You selected News")
+      break
+    case "Login":
+      document.write("You selected Login")
+      break
+    case "Links":
+      document.write("You selected Links")
+      break
+  }
+</script>

15/15.html

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+<script>
+  switch (page)
+  {
+    case "Home":
+      document.write("You selected Home")
+      break
+    case "About":
+      document.write("You selected About")
+      break
+    case "News":
+      document.write("You selected News")
+      break
+    case "Login":
+      document.write("You selected Login")
+      break
+    case "Links":
+      document.write("You selected Links")
+      break
+    default:
+      document.write("Unrecognized selection")
+      break
+  }
+</script>

15/16.html

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+<script>
+  document.write(
+    a <= 5 ?
+    "a is less than or equal to 5" :
+    "a is greater than 5"
+  )
+</script>

15/17.html

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+<script>
+  counter=0
+
+  while (counter < 5)
+  {
+    document.write("Counter: " + counter + "<br>")
+    ++counter
+  }
+</script>

15/18.html

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+<script>
+  count = 1
+
+  do
+  {
+    document.write(count + " times 7 is " + count * 7 + "<br>")
+  } while (++count <= 7)
+</script>

15/19.html

@@ -0,0 +1,6 @@
+<script>
+  for (count = 1 ; count <= 12 ; ++count)
+  {
+    document.write(count + " times 12 is " + count * 12 + "<br>");
+  }
+</script>

15/20.html

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+<script>
+  haystack     = new Array()
+  haystack[17] = "Needle"
+
+  for (j = 0 ; j < 20 ; ++j)
+  {
+    if (haystack[j] == "Needle")
+    {
+      document.write("<br>- Found at location " + j)
+      break
+    }
+    else document.write(j + ", ")
+  }
+</script>

15/21.html

@@ -0,0 +1,17 @@
+<script>
+  haystack     = new Array()
+  haystack[4]  = "Needle"
+  haystack[11] = "Needle"
+  haystack[17] = "Needle"
+
+  for (j = 0 ; j < 20 ; ++j)
+  {
+    if (haystack[j] == "Needle")
+    {
+      document.write("<br>- Found at location " + j + "<br>")
+      continue
+    }
+
+    document.write(j + ", ")
+  }
+</script>