knitr (version 1.1)

combine_words: Combine multiple words into a single string

Description

When a value from an inline R expression is a character vector of multiple elements, we may want to combine them into a phrase like a and b, or a, b, and c. That is what this a helper function does.

Usage

combine_words(words, sep = ", ", and = " and ", before = "", after = before)

Arguments

words

a character vector

sep

the separator to be inserted among words

and

a character string to be prepended to the last word

before, after

A character string to be added before/after each word

Value

• A character string.

Details

If the length of the input words is smaller than or equal to 1, words is returned. When words is of length 2, the first word and second word are combined using the and string. When the length is greater than 2, sep is used to separate all words, and the and string is prepended to the last word.

Examples

combine_words("a")
combine_words(c("a", "b"))
combine_words(c("a", "b", "c"))
combine_words(c("a", "b", "c"), sep = "/ ", and = "")
combine_words(c("a", "b", "c"), and = "")
combine_words(c("a", "b", "c"), before = """, after = """)