User Guide

null 647
null
Availability
Flash Player 5.
Usage
null
Parameters
None.
Returns
Nothing.
Description
Constant; a special value that can be assigned to variables or returned by a function if no data
was provided. You can use
null to represent values that are missing or that do not have a defined
data type.
Example
In a numeric context, null evaluates to 0. Equality tests can be performed with null. In this
statement, a binary tree node has no left child, so the field for its left child could be set to
null.
if (tree.left == null) {
tree.left = new TreeNode();
}
CHAPTER 2
ActionScript Language Reference