Functions Reference

Chapter 8
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Logical functions 127
Chapter 8
Logical functions
Logical functions test for a condition to evaluate it as true or false. This is known as a
Boolean value. If the condition is true, FileMaker Pro returns a 1; if the condition is false,
FileMaker Pro returns a 0. You can use the keywords True and False with logical
functions and operators when a Boolean value is needed. Keyword True returns 1 and
keyword False returns 0.
Logical functions can also evaluate parameters such as text or arithmetic operations that
do not make a true or false statement, or in the case of the GetField function, return the
contents of another field.
Click a function name for details.
This function Returns
Case, page 128 One of several possible results based on a series of tests.
Choose, page 128 One result value, according to the integer value of a specified test.
Evaluate, page 129 Evaluates the specified expression
as a calculation.
EvaluationError, page 131 An error code, if any, from the specified expression.
GetAsBoolean, page 131 0 if the specified data has a value of 0 or is empty, otherwise returns 1.
GetField, page 132 The contents of the referenced field.
GetLayoutObjectAttribute,
page 133
The requested layout object attributes from the calculation's active window.
GetNthRecord, page 134 The contents of the referenced field from the requested record number.
If, page 135 One of two possible results depending on the value of the specified test.
IsEmpty, page 136 True(1) if the specified field is empty, if the related field, related table,
relationship, or file is missing, or if some other error occurs; otherwise
returns False(0).
IsValid, page 137 0 when a record contains an invalid value because of a data type mismatch
(text in a date field, for example).
IsValidExpression, page
137
True(1) if the syntax of the specified expression is correct.
Let, page 138 Sets variable to the result of value for the duration of the specified
expression.
Lookup, page 140 The value specified in the sourceField parameter using the relationships
in the relationships graph
.
LookupNext, page 141 The value specified in the sourceField parameter using the relationships
in the relationships graph.