Values and Constants

A value is a simple data structure that can be represented, stored, and manipulated within AppleScript. AppleScript recognizes many types of values, including character strings, real numbers, integers, lists, and dates. Values are fundamentally different from application objects, which can be manipulated from AppleScript, but are contained in applications or their documents. Values can be created in scripts or returned as results of commands sent to applications.

Values are an important means of exchanging data in AppleScript. When you request information about application objects, it is usually returned in the form of values. Similarly, when you provide information with commands, you typically supply it in the form of values.

A fixed number of specific types of values are recognized by AppleScript. You cannot define additional types of values, nor can you change the way values are represented. The different types of AppleScript values, called value classes, are described in Values and Constants

A constant is a reserved word with a predefined value. AppleScript provides constants to help your scripts perform a variety of tasks, such as retrieving information about an object's properties, performing comparisons, and performing arithmetic operations. Values and Constants describes AppleScript's constants.