Information Functions

ISEMPTYReturns the value True or False depending if the Variant variable has been initialised (Boolean).
ISERRORReturns the value True or False depending if the expression is an error (Boolean).
ISMISSINGReturns the value True or False depending if the optional argument has been passed to a procedure (Boolean).
ISNULLReturns the value True or False depending if the expression contains no data (Boolean).
ISNUMERICReturns the value True or False depending if the expression is a number (Boolean).
ISEMPTY
Returns the value True or False depending if the Variant variable has been initialised (Boolean).
ISERROR
Returns the value True or False depending if the expression is an error (Boolean).
ISMISSING
Returns the value True or False depending if the optional argument has been passed to a procedure (Boolean).
ISNULL
Returns the value True or False depending if the expression contains no data (Boolean).
ISNUMERIC
Returns the value True or False depending if the expression is a number (Boolean).
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