IsEmpty()
Determine if the result of an expression or variable is empty.
Syntax
IsEmpty(<exp>) --> lEmpty
Arguments
<exp> --> is an expression of any data type.
Returns
IsEmpty() returns TRUE if the expression results in an empty value, otherwise FALSE. The criteria for determining whether a value is considered empty depends on the data type of <exp> according to the these rules:
|
Array |
no elements (zero-length) |
|
Character |
Spaces, tabs, CR/LF, or ("") |
|
Transaction numbers |
Transaction zero returns TRUE, all others FALSE. |
|
Numeric |
0 (zero) |
|
Date |
Null (CTOD("")) |
|
Logical |
FALSE |
|
NIL |
NIL |
Description
Use the IsEmpty() function to determine if a parameter is unsupplied. For example, in response to a user question on a form. It can also test if arrays have no elements.
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Related Topics:
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