Suggestion for null coalescence operator

[daniel-simeone]

I couldn't help but notice the lovely little %|0|% operator (currently not exported) in operators.R (right after %||%)

1. I'd vote for it to be exported - I love it.
2. Here's an extension to extend it to work better for data frames with zero rows (but with non-zero columns):

`%|0|%` <- function(x, y) {
  if ("data.frame" %in% class(x)) {
    if(!nrow(x)) y else x
  } else{
    if (!length(x)) y else x
    }
}

[lionel-]

You can use vctrs::"%0%" for this. It supports empty data frames as well.

[DanChaltiel]

@lionel- This is actually a very useful feature for packages that import rlang. Moreover, I always expect rlang::`%||%` to behave that way, so IMHO they kind of belong together.

Could you consider re-exporting it? For most packages importing rlang, importing vctrs is quite an overkill.

[lionel-]

The problem is that rlang and vctrs are designed to be imported together, and the latter uses vec_is_empty() in its %0% implementation which rlang can't use.