Does anyone know how to program a function in VBA that will count the total
number of unique observations in an array?

I imagine that the syntax would be:

=UNIQUE(array)

For instance, if an array of 5 observation look like this

apple
orange
apple
apple
banana

the Unique() function would return 3.

I am aware that you can do this with a pivot table, but the unique function
would be a lot more convenient. It is also probable there is another way to
do this with built-in excel functions.

Please let me know if you have any ideas.

Thanks,
Henrik