Why does this function compare to an arbitrary number as a null check?

The author is using this as a method of clearing or unsetting the variable. By setting the value of Value to an empty string, it clears any previous value. The author could have just as easily set it equal to 0, vbNull, or vbEmpty.

It really depends on what you are doing with the value later in your script. If you go on to perform further checks on the variable, setting it to vbNull may not be advisable and setting it equal to vbEmpty may crash your script if you are using Option Explicit.

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