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I have used the following VBA code:
Do While .Cell(i,1) <> Empty ' doing things i = i+1 Loop to iterate through columns (with Double/Integer values) in Excel. Then I found a case where the test evaluates to False whenever the value of the cell is 0. I have no idea what the difference is between this case and the working ones.
If I change the test to:
Do While Not IsEmpty(.Cell(i,1)) .. Loop it works fine. So my question is: What is the difference between how IsEmpty() and =Empty is evaluated? In what cases will =Empty evaluate to True for cells with value 0?
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VBA IsEmpty is a logical function that tests whether selected is empty or not. Since it is a logical function it will return the results in Boolean values i.e. either TRUE or FALSE. If the selected cell is empty it will return TRUE or else it will return FALSE.
If you wish to test whether a worksheet cell is empty in VBA, you can not use the worksheet function called ISBLANK. In VBA, you must use the ISEMPTY function. In this example, we will test whether cell A1 is empty. If cell A1 is empty, the message "Cell A1 is empty" will be displayed.
To check if a cell is empty you can use VBA's ISEMPTY function. In this function, you need to use the range object to specify the cell that you want to check, and it returns true if that cell is empty, otherwise false. You can use a message box or use a cell to get the result.
ISNULL in VBA is a logical function which is used to determine whether a given reference is empty or NULL or not that is why the name ISNULL, this is an inbuilt function which gives us true or false as a result, based on the result we can arrive to conclusions, if the reference is empty it returns true value else false ...
Empty refers to a variable being at its default value. So if you check if a cell with a value of 0 = Empty then it would return true.
IsEmpty refers to no value being initialized.
In a nutshell, if you want to see if a cell is empty (as in nothing exists in its value) then use IsEmpty. If you want to see if something is currently in its default value then use Empty.
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From the Help:
IsEmpty returns True if the variable is uninitialized, or is explicitly set to Empty; otherwise, it returns False. False is always returned if expression contains more than one variable.
IsEmpty only returns meaningful information for variants.
To check if a cell is empty, you can use cell(x,y) = "".
You might eventually save time by using Range("X:Y").SpecialCells(xlCellTypeBlanks) or xlCellTypeConstants or xlCellTypeFormulas
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