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Is functions - Wikipedia, the free encyclopedia. For the isxxxx() functions in the standard libraries of the C and C++ programming languages, see ctype. Function availability. Function name. VB 6. VBAVBScript. VB .

NETT- SQLIs. Array. Yes. Yes. Yes. Yes. No. Is. Date. Yes. Yes. Yes. Yes. Yes. Is. DBNull. No. No. No. Yes. No. Is. Empty.

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Yes. Yes. Yes. No. No. Is. Error. Yes. Yes. No. Yes. No. Is. Missing. Yes. Yes. No. No. No. Is. Nothing. No. No. No.

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Yes. No. Is. Null. Yes. Yes. Yes. No. Yes. Is. Numeric. Yes. Yes. Yes. Yes. Yes. Is. Object. Yes. Yes. Yes. No. No.

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Is. Reference. No. No. No. Yes. No. The Is functions (also known as data information functions,data inspection functions, or data- testing functions) are a set of functions in Microsoft's Visual Basic 6, Visual Basic for Applications, VBScript, and Visual Basic . NET. Several of them are also provided in Transact- SQL by the . NET Framework Data Provider for Microsoft SQL Server. What the functions do.

The data validation functions determine whether it is possible to convert or coerce the data value given as an argument to the function to the type implied by the function name, and return a Boolean value recording whether it was possible or not. The validation functions allow one to test whether a conversion would fail, and change the program's flow of control in an if statement.) True indicates that conversion would be possible, False indicates that it would not be. Similarly the type checking functions return a Boolean recording whether the argument expression is of a particular type.

In Transact- SQL, the functions return zero or one rather than Boolean values True and False. Is. Array(name)This function determines whether the variable name passed as its argument is an array. Uninitialized arrays will, note, return False from this function in Visual Basic . NET. In Visual Basic 6, arrays are not reference types, and an uninitialized array will return True from this function just like an initialized array.

Is. Date(expression)This function determines whether the expression passed as its argument can be converted to a variable of type Date, or is already of type Date. Uninitialized variables that are of type Date can of course be converted, despite being uninitialized, so this will always return True for such variables. Note that strings that contain a day of the week in addition to a date (e. In VBScript and Visual Basic . NET, the conversion process employs the locale settings of Microsoft Windows, meaning that what may parse as a date on one system, configured to use one locale, may fail to parse as a date on another system, configured to use a different locale. Is. DBNull(expression)This function determines whether the expression passed as its argument evaluates to System. DBNull. Value. This is equivalent to Visual Basic 6's Is.

Null() function. Note that it is not possible to directly compare an expression for equality to System. DBNull, because any expression of the form x = Db. Null will evaluate to Db. Null simply because it contains a null.

Is. DBNull() is the only way to test for equality to System. DBNull. Is. Empty(expression)This function determines whether the expression passed as its argument is an uninitialized variant. Note that an uninitialized variant is distinct from a variant that has been initialized to hold Null. Although the function takes an expression, rather than simply a variable name, any expression that isn't simply a variable name is considered not to be an uninitialized variant. Gre Big Book Word List Pdf read more. This function was available in Visual Basic 6, but has been superseded in Visual Basic .

NET by the Is. Nothing() function. In VBScript, if a variant is assigned Nothing, this function still returns False. Is. Error(expression)This function, in Visual Basic . NET, determines whether the expression passed as its argument is an exception object, i. In Visual Basic 6, the function tests whether the expression is a variant with the special vb. Error subtype. Is.

Missing(name)This function determines whether the variable name passed as its argument is an optional argument that was not passed to a function by its caller. It returns True only of the variable is a variant that has not been initialized. This function only exists in Visual Basic 6.

In Visual Basic . NET, optional parameters are required to have default initializers, and the function no longer exists. Is. Nothing(expression)This function determines whether the expression passed as its argument evaluates to Nothing. It is a simple library function (comprising just 4 CIL instructions) which can itself be written in Visual Basic as: Public. Shared. Function.

Is. Nothing(By. Val. Expression. As. Object)As. Boolean. Return(Expression. Is. Nothing)End. Function. The effect of this is to return False for all value (non- reference) expressions, because they will be wrapped up, as part of the function call, into objects, which will by their very natures, not be null objects.