Vba difference between null and empty

You can write VBA functions that accept optional arguments, like this one where you must supply 2 values, and can supply a third:. A prints as numeric value 1. B prints as the string, "hello". C prints as Error which means 'Named argument not found. Since we passed in only 2 arguments the 3rd one is Missing. So, Missing is actually an error value, and you will get an error if you try to do anything with it. VBA provides the IsMissing function so you can avoid the error by testing for it like this:.

In the example above, we did not declare any data type for the 3 arguments a, b, and c , so VBA treats them as variants. If we had declared c as any other VBA type, it would not be Missing, but would be the initial value for that type. Missing : an omitted argument variant. Rate this article:. This is a cached tutorial , reproduced with permission. Access Database Repair Service. NET and C projects.

Get emails out to your customers reliably, and without hassle, every single time. Strings can sometimes be null or empty. The difference between null and empty is that the null is used to refer to nothing while empty is used to refer a unique string with zero length. Tutorials Point. She is passionate about sharing her knowldge in the areas of programming, data science, and computer systems. View all posts.

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For a better experience, please enable JavaScript in your browser before proceeding. You are using an out of date browser. Note that you cannot normally compare 0 to "", as they are different data types:. Empty : an uninitialized variant. You can write VBA functions that accept optional arguments, like this one where you must supply 2 values, and can supply a third:.

A prints as numeric value 1. B prints as the string, "hello". C prints as Error which means 'Named argument not found. Since we passed in only 2 arguments the 3rd one is Missing. So, Missing is actually an error value, and you will get an error if you try to do anything with it.

VBA provides the IsMissing function so you can avoid the error by testing for it like this:.