Language Guide

CHAPTER 3
Values
Value Class Definitions 41
Boolean 3
A value of class Boolean is a logical truth value. The most common Boolean
values are the results of comparisons, such as 4 > 3 and WordCount = 5.
The two possible Boolean values are true and false.
LITERAL EXPRESSIONS
true
false
PROPERTY
Class The class identifier for the object. This property is read-only, and
its value is always boolean.
ELEMENTS
None
OPERATORS
The operators that take Boolean values as operands are And, Or, Not, &, =,
and .
The = operator returns true if both operands evaluate to the same Boolean
value (either true or false); the  operator returns true if the operands
evaluate to different Boolean values.
The binary operators And and Or take Boolean expressions as operands and
return Boolean values. An And operation, such as (2 > 1) and (4 > 3),
has the value true if both its operands are true, and false otherwise. An Or
operation, such as (theString = "Yes") or (today = "Tuesday"),
has the value true if either of its operands is true.
The unary Not operator changes a true value to false or a false value
to true.
COERCIONS SUPPORTED
AppleScript supports coercion of a Boolean value to a single-item list.