#' Tidy eval helpers
#'
#' @description
#'
#' * \code{\link[rlang]{sym}()} creates a symbol from a string and
#' \code{\link[rlang]{syms}()} creates a list of symbols from a
#' character vector.
#'
#' * \code{\link[rlang]{enquo}()} and \code{\link[rlang]{enquos}()}
#' delay the execution of one or several function arguments.
#' \code{enquo()} returns a single quoted expression, which is like
#' a blueprint for the delayed computation. \code{enquos()} returns
#' a list of such quoted expressions.
#'
#' * \code{\link[rlang]{expr}()} quotes a new expression _locally_. It
#' is mostly useful to build new expressions around arguments
#' captured with [enquo()] or [enquos()]:
#' \code{expr(mean(!!enquo(arg), na.rm = TRUE))}.
#'
#' * \code{\link[rlang]{as_name}()} transforms a quoted variable name
#' into a string. Supplying something else than a quoted variable
#' name is an error.
#'
#' That's unlike \code{\link[rlang]{as_label}()} which also returns
#' a single string but supports any kind of R object as input,
#' including quoted function calls and vectors. Its purpose is to
#' summarise that object into a single label. That label is often
#' suitable as a default name.
#'
#' If you don't know what a quoted expression contains (for instance
#' expressions captured with \code{enquo()} could be a variable
#' name, a call to a function, or an unquoted constant), then use
#' \code{as_label()}. If you know you have quoted a simple variable
#' name, or would like to enforce this, use \code{as_name()}.
#'
#' To learn more about tidy eval and how to use these tools, visit
#' \url{http://tidyeval.tidyverse.org} and the
#' \href{https://adv-r.hadley.nz/metaprogramming.html}{Metaprogramming
#' section} of \href{https://adv-r.hadley.nz}{Advanced R}.
#'
#' @md
#' @name tidyeval
#' @keywords internal
#' @importFrom rlang expr enquo enquos sym syms .data := as_name as_label
#' @aliases expr enquo enquos sym syms .data := as_name as_label
#' @export expr enquo enquos sym syms .data := as_name as_label
NULL
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