Feature request: sep argument in str_dup.

[maellecoursonnais]

I was going through this SO question, and thought that it might be useful to add an optional sep argument to str_dup.

For instance, in the case of the SO question the OP wants to repeat a string and add ; between every repeated value.

n = 3
input = c(67L, 24L, 72L, 3L)
expected_output = c("67;67;67", "24;24;24", "72;72;72", "3;3;3")

So far, what one can do is:

library(stringr)
library(purrr)
map_chr(input, ~ str_flatten(rep(.x, each = n), ";"))
#[1] "67;67;67" "24;24;24" "72;72;72" "3;3;3"

Or in base R:

sapply(input, \(x) paste(rep(x, n), collapse=";")) 

But what about a simple str_dup call?

str_dup(input, n, sep = ";")