concatenate: concatenate: Comma Concatenation
Description
Each function in concatenate returns a comma-separated string. (A length-one
character vector.) They can be used to construct human-friendly messages
whose elements aren't known in advance, like calls to message,
warning or stop, from clean code.
Details
The workhorse function is cc. cn combines it with
grammatical number awareness, as in ngettext, and
sprintf-like substitution.