Nothing
`%||%` <- function(x, y) {
if (is.null(x)) y else x
}
new_data_frame <- function(x) {
structure(x, row.names = c(NA, length(x[[1]])), class = "data.frame")
}
# rep_len became an S3 generic in R 3.6, so we need to use
# something else to make sure recycle_common() works on old
# R versions
rep_len_compat <- function(x, length_out) {
rep(x, length.out = length_out)
}
recycle_common <- function(...) {
dots <- list(...)
lengths <- vapply(dots, length, integer(1))
non_constant_lengths <- unique(lengths[lengths != 1])
if (length(non_constant_lengths) == 0) {
final_length <- 1
} else if(length(non_constant_lengths) == 1) {
final_length <- non_constant_lengths
} else {
lengths_label <- paste0(non_constant_lengths, collapse = ", ")
stop(sprintf("Incompatible lengths: %s", lengths_label))
}
dots[lengths != final_length] <- lapply(dots[lengths != final_length], rep_len_compat, final_length)
dots
}
is_vector_class <- function(x) {
identical(class(x[integer(0)]), class(x))
}
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