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#' Return first non-missing element
#'
#' It is an alias for data.table `fcoalesce`. For details see [fcoalesce][data.table::fcoalesce]
#' @param ... vectors
#'
#' @return A vector the same length as the first ... argument with NA
#' values replaced by the first non-missing value.
#'
#' @examples
#' # examples from dplyr
#' x = sample(c(1:5, NA, NA, NA))
#' coalesce(x, 0L)
#'
#' y = c(1, 2, NA, NA, 5)
#' z = c(NA, NA, 3, 4, 5)
#' coalesce(y, z)
#' @export
coalesce = data.table::fcoalesce
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