A concise way in R to count unique values in each dataframe column, by group?

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Peter Schneider
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A concise way in R to count unique values in each dataframe column, by group?
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(stackoverflow.com/users/23186059/io-ferenghetti)Io Ferenghetti
(stackoverflow.com/users/4272725/aksela)AkselA
(stackoverflow.com/users/14587041/samet-s%c3%b6kel)Samet Sökel
(stackoverflow.com/users/14923149/umar)Umar
(stackoverflow.com/users/19578756/murad-khalilov)Murad Khalilov
(stackoverflow.com/users/13321647/tarjae)TarJae
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