City as a factor. Levels are the categories.

Goal

Print levels for Kenya cities.

city <- factor(c("Nairobi", "Mombasa", "Nairobi", "Kisumu"))
print(city)
print(levels(city))

city <- factor(c("Nakuru", "Eldoret", "Nakuru"))
print(table(city))

city <- factor(c("Nairobi", "Kisumu"), levels = c("Nairobi", "Mombasa", "Kisumu"))
print(city)

print(as.character(factor(c("Mombasa", "Mombasa"))))