Type Checking Functions
Description
Determine type of data.
- Name
- Description
- ISALPHA Function
Returns TRUE if the first character of a string is a letter.
- ISDATE Function
Returns .T. if Date is a valid date.
- ISDIGIT Function
Returns TRUE if the first character of a string is a digit.
- ISLOWER Function
Returns TRUE if the first character of a string is lowercase.
- ISNOTBLANK Function
Returns TRUE if the field is not blank.
- ISNULL Function
Tests if a string is empty or contains only whitespace.
- ISNUMBER Function
Returns .t. if a text string contains only numbers
- IsShortTime Function
Returns true is the string value is a valid short time.
- ISTIME Function
Returns true is the string value is a valid datetime.
- ISUPPER Function
Returns TRUE if the first character of a string is uppercase.
Related Functions
ISALPHA() - Returns . T. (TRUE) if the first character of the specified Character_String is a letter; otherwise, returns .F. (FALSE).
ISBLANK() - Returns .T. (TRUE) if the field identified in the Field_Name is blank; otherwise, it returns .F. (FALSE).
ISDATE() - Returns .T. (TRUE) if Date_String is a valid date; otherwise, returns .F. (FALSE).
ISNUMBER() - Returns .T. if a character string contains only numbers; otherwise, returns .F. (FALSE).