#' draw_names
#'
#' Draw graph for multiple names on the prenoms data
#' @param names Names to be graphed in vector form
#' @return graph for queried names
#' @import assertthat
#' @import dplyr
#' @import tidyr
#' @import dygraphs
#' @import prenoms
#' @examples
#' draw_names(c("Dana", "Maria"))
#' @export
draw_names <- function(names) {
assert_that(is.vector(names))
prenoms %>%
group_by(year,name) %>%
summarise(total = sum(n)) %>%
filter(name %in% names) %>%
spread(key = name, value = total) %>%
dygraph()
}
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