c.md
In stringr: Simple, Consistent Wrappers for Common String Operations

obeys tidyverse recycling rules

Code
  str_c(c("x", "y"), character())
Condition
  Error in `str_c()`:
  ! Can't recycle `..1` (size 2) to match `..2` (size 0).

vectorised arguments error

Code
  str_c(letters, sep = c("a", "b"))
Condition
  Error in `str_c()`:
  ! `sep` must be a single string, not a character vector.
Code
  str_c(letters, collapse = c("a", "b"))
Condition
  Error in `str_c()`:
  ! `collapse` must be a single string or `NULL`, not a character vector.