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CHAPTER 8: ExtendScript Tools and Features Operator overloading 235

Operator overloading

ExtendScript allows you to extend or override the behavior of a math or a Boolean operator for a specific

class by defining a method in that class with same name as the operator. For example, this code defines

the addition (

+) operator for the class MyClass. In this case, the addition operator simply adds the operand

to the property value:

// define the constructor method

function MyClass (initialValue) {

this.value = initialValue;

}

// define the addition operator

MyClass.prototype [“+”] = function (operand) {

return this.value + operand;

}

This allows you to perform the "+" operation with any object of this class:

var obj = new MyClass (5);

Result: [object Object]

obj + 10;

Result: 15

#target name

Defines the target application for this JSX file. The name value is an application

specifier; see Application and namespace specifiers

. Enclosing quotes are optional.

If the Toolkit is registered as the handler for files with the

.jsx extension (as it is by

default), opening the file opens the target application to run the script. If this

directive is not present, the Toolkit loads and displays the script. A user can open a

file by double-clicking it in a file browser, and a script can open a file using a

File

object’s

execute method.

#targetengine

enginename

Defines the target JavaScript engine for this JSX file, within the designated target

application.

Supported by Adobe Illustrator CS5 and Adobe InDesign CS5; other applications

ignore the directive.

X For Adobe Illustrator CS5 and Adobe InDesign CS5, if the named engine does

not exist, and if the script originates within the application (rather than being

executed in the ExtendScript Toolkit or received in an interapplication message),

the application creates a new JavaScript engine with this name, which persists

for the lifetime of the application session.

X If the script originates outside the application, and the named engine does not

exist, the directive is ignored.

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