R/list.select.R

In rlist: A Toolbox for Non-Tabular Data Manipulation

#' Select by name or expression for each member of a list
#'
#' @param .data A \code{list} or \code{vector}
#' @param ... A group of implicit labmda expressions
#' @export
#' @examples
#' x <- list(p1 = list(type='A',score=list(c1=10,c2=8)),
#'        p2 = list(type='B',score=list(c1=9,c2=9)),
#'        p3 = list(type='B',score=list(c1=9,c2=7)))
#' list.select(x, type)
#' list.select(x, tp = type)
#' list.select(x, type, score)
#' list.select(x, type, score.range = range(unlist(score)))
list.select <- function(.data, ...) {
  args <- set_argnames(dots(...))
  quote <- as.call(c(quote(list), args))
  list.map.internal(.data, quote, parent.frame())
}