#' The length of a string (in characters)
#'
#' @param x A character vector.
#' @returns An integer vector the same length as `x`.
#' `NA` strings have `NA` length.
#' @seealso [nchar()]
#' @export
#' @examples
#' str_length(letters)
#' str_length(c("i", "like", "programming", NA))
str_length <- function(x) {
}
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