#' Convert object with attributes in "map" to factor
#'
#' Used to extract texts from a variable containing numeric values.
#' @param x Object with "map" attributes, where levels and labels exist
#' @return Factor
#' @examples
#' df <- data.frame(cars = 1:3)
#' attr(df$cars, "map") <-
#' data.frame(levels = 1:3, labels = c("Volvo", "Saab", "Opel"))
#' attr_to_factor(df$cars)
#' @export
attr_to_factor <- function(x) {
factor(x, attr(x, "map")$levels, attr(x, "map")$labels)
}
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