JavaScript For...In Statement

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JavaScript For...In Statement
The for...in statement loops through the elements of an array or through the properties of an object.
Syntax
for (variable in object)
  {
  code to be executed
  }  

Note: The code in the body of the for...in loop is executed once for each element/property.
Note: The variable argument can be a named variable, an array element, or a property of an object.
Example
Use the for...in statement to loop through an array:

<html>
<body>

<script type="text/javascript">
var x;
var mycars = new Array();
mycars[0] = "Saab";
mycars[1] = "Volvo";
mycars[2] = "BMW";

for (x in mycars)
  {
  document.write(mycars[x] + "<br />");
  }
</script>

</body>
</html>
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