Javascript Arrays

Arrays

Below is an example about nulls and arrays

  var arrayTest = new Array();
  arrayTest[0] = 'hello';
  arrayTest[3] = 'bye';
  var output = "arrayTest length: " + arrayTest.length;
  output += "\n";
  output += "0: " + arrayTest[0];
  output += "\n";
  output += "1: " + arrayTest[1];
  output += "\n";
  if (arrayTest[1] == null) {
      output += "arrayTest[1] is null\n";
  }
  output += "2: " + arrayTest[2];
  output += "\n";
  output += "3: " + arrayTest[3];
  output += "\n";

output now holds:

arrayTest length: 4
0: hello
1: undefined
arrayTest[1] is null
2: undefined
3: bye