Connect given words with a conjunction, e.g. "and" and "or".
join(words, conjunction = "or")A vector of list whose items can be converted to characters.
A single character which represents a conjunction word.
The default value is "or".
If has length 1 or less, words is returned. Or items of words
are concatenated and returned.
words <- c("apple", "orange", "Pink Floyd")
join(words, "and")
#> [1] "apple, orange and Pink Floyd"