Expressions

An expression is any series of AppleScript words that has a value. You use expressions to represent or derive values in scripts. When AppleScript encounters an expression, it converts it into an equivalent value. This is known as evaluation .

The simplest kinds of expressions, called literal expressions, are representations of values in scripts. For more information on literal expressions, including examples, see Values and Constants

This chapter describes expressions in the following sections:

Results of Expressions describes how you can use the Script Editor to evaluate an expression and display its value.
Variables describes how to create and use variables. Topics covered include reference variables, data sharing, the scope of variables, and the predefined variables available in AppleScript.
Script Properties describes script properties, which are named containers for values that you can use in the same way you use variables.
AppleScript Properties describes global properties of AppleScript, which you can use in any script. Some properties act as constants, but you can modify AppleScript's Text Item Delimiters, which AppleScript uses in performing various string operations.
Reference Expressions describes compound expressions that refer to objects in applications, and which you can use to represent values in scripts.
Operations describes expressions that use operators (such as addition or concatenation) to derive values from other values.