last (?) argument to collapse

[hadley]

So you can do:

collapse(1:4, ",", last = ", and ")
#> 1, 2, 3, and 4

[jimhester]

Oxford comma, surprising hadley!

[jonocarroll]

r-lib/cli#128 (for tidy developer day) can be resolved by adding this feature. What do you think about an oxford = TRUE for when there are >= 3 arguments? I'm happy to make the PR for that.

[math-mcshane]

I thought I had an original idea to introduce an oxford = TRUE parameter to glue_collapse (presumably the successor to collapse). It looks like I wasn't the first.

If there was a oxford = TRUE parameter, AFAIK, it's gone/inaccessible now:

glue::glue_collapse(x = 1:4, sep = ", ", last = ", and ")
#> 1, 2, 3, and 4
try(glue::glue_collapse(x = 1:4, sep = ", ", last = " and ", oxford = TRUE))
#> Error in glue::glue_collapse(x = 1:4, sep = ", ", last = " and ", oxford = TRUE) : 
#>   unused argument (oxford = TRUE)

I am also not seeing a collapse in cli, FWIW, just successor functions.

Signed, pro-Oxford comma guy.