MACROMEDIA FLEX-FLEX ACTIONSCRIPT LANGUAGE Reference page 187

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Availability
Flash Player 5.
Usage
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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
data type.
Example
In a numeric context,
statement, a binary tree node has no left child, so the field for its left child could be set to
if (tree.left == null) {
tree.left = new TreeNode();
}
ActionScript Core Language Elements
to represent values that are missing or that do not have a defined
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evaluates to 0. Equality tests can be performed with
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CHAPTER 5
. In this
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.
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