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#' Select variables with a function
#'
#' This [selection helper][language] selects the variables for which a
#' function returns `TRUE`.
#'
#' @param fn A function that returns `TRUE` or `FALSE` (technically, a
#' _predicate_ function). Can also be a purrr-like formula.
#'
#' @return A selection of columns
#'
#' @name where
where <- function(fn) {
predicate <- rlang::as_function(fn)
function(x, ...) {
out <- predicate(x, ...)
if (!rlang::is_bool(out)) {
rlang::abort("`where()` must be used with functions that return `TRUE` or `FALSE`.")
}
out
}
}
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