Web Reference: Sep 4, 2021 · When creating your VBA subs and functions, you may come across a time where you want to have an optional parameter - something that the calling procedure doesn’t have to specify, but can if they like. You may also want to have that optional argument have a default value in case nothing is supplied. So how do we do this? It’s easier than you ... When you call a procedure with an optional argument, you can choose whether or not to specify the optional argument. If you don't specify the optional argument, the default value, if any, is used. If no default value is specified, the argument would be for any variable of the specified type. Here, both L1 and L2 are required but P1 and P2 are optional. Since both are Variant types, we can use IsMissing to determine whether the parameter was passed in. IsMissing returns True if the Variant parameter is omitted, or False if the Variant parameter is included.
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