串函数，将以逗号分隔的单词向量与"and"连接.在最后一句话之前 [英] stringr function to concatenate vector of words separated by comma with "and" before last word

问题描述

我知道我可以很容易地写一个，但是没有人知道stringer(或stringi)是否已经具有一个函数，该函数将一个或多个单词的向量连接起来，这些向量之间用逗号隔开，但在最后一个单词之前加上"and"?

I know I can easily write one, but does anyone know if stringr (or stringi) already has a function that concatenates a vector of one or more words separated by commas, but with an "and" before the last word?

推荐答案

您可以使用knitr::combine_words函数

knitr::combine_words(letters[1:2])
# [1] "a and b"
knitr::combine_words(letters[1:3])
# [1] "a, b, and c"
knitr::combine_words(letters[1:4])
# [1] "a, b, c, and d"

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