User Guide

Chapter 4: ColdFusion Expressions: Operators and Other Constructs 579

Boolean operators

Boolean, or Logical, operators perform logical connective and negation operations.

The operands of Boolean operators are Boolean (TRUE/FALSE) values.

Operator Precedence

The order of precedence controls which operator is evaluated first in an expression.

Operators on the same line have the same precedence.

Unary +, Unary -

*, /

MOD

+, -

EQ, NEQ, LT, LTE, GT, GTE, CONTAINS, DOES NOT CONTAIN

NOT

AND

Boolean Operators

Operator Description

NOT Reverses the value of an argument. For example, NOT

TRUE is FALSE and vice versa.

AND Returns TRUE if both arguments are TRUE; returns FALSE

otherwise. For example, TRUE AND TRUE is TRUE, but

TRUE AND FALSE is FALSE.

OR Returns TRUE if any of the arguments is TRUE; returns

FALSE otherwise. For example, TRUE OR FALSE is TRUE,

but FALSE OR FALSE is FALSE.

XOR Exclusive or—either, or, but not both. Returns TRUE if the

truth values of both arguments are different; returns

FALSE otherwise. For example, TRUE XOR TRUE is FALSE,

but TRUE XOR FALSE is TRUE.

EQV Equivalence both true or both false. The EQV operator is

the opposite of the XOR operator. For example, TRUE EQV

TRUE is TRUE, but TRUE EQV FALSE is FALSE.

IMP Implication. A IMP B is the truth value of the logical

statement “If A Then B.” A IMP B is FALSE only when A is

TRUE and B is FALSE.