ActionScript for Flash MX: The Definitive Guide, Second Edition

This is the Title of the Book, eMatter Edition

Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.

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Chapter 5: Operators

Other Operators

The remaining operators apply to topics considered in other chapters. We’ll include

them here for quick reference only and describe their usage fully in those chapters.

The typeof Operator

The typeof operator is used to determine the datatype of an expression or identifier.

It takes one operand, as follows:

typeof operand

where operand can be any legal expression. The return value of the typeof operation is

a string indicating the datatype of the evaluated

operand. See Chapter 3 for more

details.

The new Operator

The new operator creates a new composite datum—either an array or an object. The

object can be a member of a built-in class or a user-defined class. The syntax for new

is:

new constructor

where constructor must be a function that defines the properties of the newly cre-

ated object. See Chapter 11, Chapter 12, and the Constructor headings in the Lan-

guage Reference.

The delete Operator

We use the delete operator to remove an object, an object property, an array ele-

ment, or variables from a script. The syntax for delete is:

delete identifier

If identifier is not a data container (i.e., a variable, property, or element), the delete

operation fails and returns the value

false; otherwise, it returns true, indicating suc-

cess. The delete operator ...