#' Number of observations in each group
#'
#' @description
#' Helper function that can be used to find counts by group.
#'
#' Can be used inside `summarize()`, `mutate()`, & `filter()`
#'
#' @export
#'
#' @examples
#' df <- data.table(
#' x = 1:3,
#' y = 4:6,
#' z = c("a","a","b")
#' )
#'
#' df %>%
#' summarize(count = n(), .by = z)
n <- function() {
abort("n() should only be used inside tidytable verbs")
}
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