use_first {assertive.base} | R Documentation |
If the input is not scalar, then only the first element is returned, with a warning.
use_first(x, indexer = c("[[", "["), .xname = get_name_in_parent(x))
x |
Input that should be scalar. |
indexer |
Either double indexing, |
.xname |
Not intended to be used directly. |
If x
is scalar, it is returned unchanged, otherwise
only the first element is returned, with a warning.
dont_stop(use_first(1:5))