'How to list the unique categorical values of a data frame column?

How to list (a list of distinct elements) the unique categorical values of a data frame column?

r list dataframe unique

Solution 1:^[1]

ResultingList <- as.list(unique(df$ColumnName))

Solution 2:^[2]

Or with purrr:

library(dplyr)
iris %>%
  select_if(is.factor) %>% 
  purrr::map(unique)

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Olivier Grimard
Solution 2	Julian