# check for packages, and stop if not installed
check4pkg <- function(x) {
if (!requireNamespace(x, quietly = TRUE)) {
stop("Please install ", x, call. = FALSE)
} else {
invisible(TRUE)
}
}
ct <- function(l) Filter(Negate(is.null), l)
`%||%` <- function(x, y) {
if (is.null(x)) y else x
}
assert <- function(x, y) {
if (!is.null(x)) {
if (!inherits(x, y)) {
stop(deparse(substitute(x)), " must be of class ",
paste0(y, collapse = ", "), call. = FALSE)
}
}
}
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