19.2 Motivation
Simple concrete example:
Cement
is a function that works like paste
but doesn’t need need quotes:
cement <- function(...) {
args <- ensyms(...)
paste(purrr::map(args, as_string), collapse = " ")
}
cement(Good, morning, Hadley)
#> [1] "Good morning Hadley"
What if we wanted to use variables ? This is where ‘unquoting’ comes in!