#' NA check
#'
#' The function checks and shows where are the NAs in the data frame or in a specific variable.
#' @param df data frame to be checked
#' @param column specific column name as string. Defaults to NULL
#' @export
#' @examples
#' df <- data.frame(
#' x = c(1,2,NA),
#' y = c(4,NA,5),
#' z = c(9,7,6))
#'
#' na_check(df)
#' na_check(df, "y")
na_check <- function(df, column = NULL) {
if (is.null(column)) {
df[!complete.cases(df),]
} else {
df[is.na(df[[column]]),]
}
}
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