Array Length

Code Example

 <script>
   var myArray = new Array();
   myArray[0] = "Bob";
   myArray[1] = "Pete";
   myArray[2] = "Paul";

   document.write("myArray[0] = " + myArray[0] + "<br>");
   document.write("myArray[1] = " + myArray[1] + "<br>");
   document.write("myArray[2] = " + myArray[2] + "<br>");

   myArray[1] = "Mike";
   document.write("myArray[1] changed to " + myArray[1] + "<br>");

   document.write("myArray[0] = " + myArray[0] + "<br>");
   document.write("myArray[1] = " + myArray[1] + "<br>");
   document.write("myArray[2] = " + myArray[2] + "<br>");

   var last_index, array_length;

   array_length = myArray.length;
   last_index = array_length - 1;

   document.write("The number of elements in my array is: " + array_length + "<br>");
   document.write("The index in the last element in myArray is: " + last_index + "<br>");
  </script>