function foo() {
  document.write(foo.arguments[2]);
}
foo(1, 2, 3, 4, 5);
foo();

The output of the script is:

3
3

The second 3 is not associated with the second foo() call, but rather with the first one. Since the second foo() call has no arguments, the arguments from the first foo() call still occupy the arguments array.

See an example for using the arguments array in Column 59, IE 5.5's Stack Support.

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