Merge branch 'main' into 1084-imap-vec

NEWS.md

@@ -1,6 +1,8 @@
 # purrr (development version)
 
 * Added `imap_vec()` (#1084)
+* `list_transpose()` inspects all elements to determine the correct
+  template if it's not provided by the user  (#1128, @krlmlr).
 
 # purrr 1.0.2
 
@@ -746,7 +748,7 @@ accessor(x[[1]])$foo
 to the equivalent pluck:
 
 ```
-x %>% pluck(1, accessor, "foo")
+x |> pluck(1, accessor, "foo")
 ```
 
 
@@ -970,7 +972,7 @@ This is a compatibility release with dplyr 0.6.0.
 
 * `set_names()` is a snake-case alternative to `setNames()` with stricter
   equality checking, and more convenient defaults for pipes:
-  `x %>% set_names()` is equivalent to `setNames(x, x)` (#119).
+  `x |> set_names()` is equivalent to `setNames(x, x)` (#119).
 
 
 ## Row based functionals
@@ -982,7 +984,7 @@ functions.
 * `map()` now always returns a list. Data frame support has been moved
   to `map_df()` and `dmap()`. The latter supports sliced data frames
   as a shortcut for the combination of `by_slice()` and `dmap()`:
-  `x %>% by_slice(dmap, fun, .collate = "rows")`. The conditional
+  `x |> by_slice(dmap, fun, .collate = "rows")`. The conditional
   variants `dmap_at()` and `dmap_if()` also support sliced data frames
   and will recycle scalar results to the slice size.
 

R/deprec-when.R

@@ -36,7 +36,7 @@
 #'
 #' @keywords internal
 #' @examples
-#' 1:10 %>%
+#' 1:10 |>
 #'   when(
 #'     sum(.) <=  50 ~ sum(.),
 #'     sum(.) <= 100 ~ sum(.)/2,

R/keep.R

@@ -68,12 +68,12 @@ compact <- function(.x, .p = identity) {
 #' @export
 #' @examples
 #' x <- c(a = 1, b = 2, cat = 10, dog = 15, elephant = 5, e = 10)
-#' x %>% keep_at(letters)
-#' x %>% discard_at(letters)
+#' x |> keep_at(letters)
+#' x |> discard_at(letters)
 #'
 #' # Can also use a function
-#' x %>% keep_at(~ nchar(.x) == 3)
-#' x %>% discard_at(~ nchar(.x) == 3)
+#' x |> keep_at(~ nchar(.x) == 3)
+#' x |> discard_at(~ nchar(.x) == 3)
 keep_at <- function(x, at) {
   where <- where_at(x, at, user_env = caller_env())
   x[where]

R/list-transpose.R

@@ -14,9 +14,9 @@
 #' @param x A list of vectors to transpose.
 #' @param template A "template" that describes the output list. Can either be
 #'   a character vector (where elements are extracted by name), or an integer
-#'   vector (where elements are extracted by position). Defaults to the names
-#'   of the first element of `x`, or if they're not present, the integer
-#'   indices.
+#'   vector (where elements are extracted by position). Defaults to the union
+#'   of the names of the elements of `x`, or if they're not present, the
+#'   union of the integer indices.
 #' @param simplify Should the result be [simplified][list_simplify]?
 #'   * `TRUE`: simplify or die trying.
 #'   * `NA`: simplify if possible.
@@ -74,8 +74,19 @@ list_transpose <- function(x,
 
   if (length(x) == 0) {
     template <- integer()
-  } else {
-    template <- template %||% vec_index(x[[1]])
+  } else if (is.null(template)) {
+    indexes <- map(x, vec_index)
+    call <- current_env()
+    withCallingHandlers(
+      template <- reduce(indexes, vec_set_union),
+      vctrs_error_ptype2 = function(e) {
+        cli::cli_abort(
+          "Can't combine named and unnamed vectors.",
+          arg = template,
+          call = call
+        )
+      }
+    )
   }
 
   if (!is.character(template) && !is.numeric(template)) {

R/superseded-transpose.R

@@ -63,6 +63,10 @@
 #' ll |> list_transpose(template = nms, default = NA)
 transpose <- function(.l, .names = NULL) {
   # 1.0.0
-  lifecycle::signal_stage("superseded", "transpose()", "list_transpose()")
+  if (!isTRUE(the$transpose_signalled)) {
+    lifecycle::signal_stage("superseded", "transpose()", "list_transpose()")
+    the$transpose_signalled <- TRUE
+  }
   .Call(transpose_impl, .l, .names)
 }
+

README.Rmd

@@ -52,7 +52,7 @@ library(purrr)
 mtcars |> 
   split(mtcars$cyl) |>  # from base R
   map(\(df) lm(mpg ~ wt, data = df)) |> 
-  map(summary) %>%
+  map(summary) |>
   map_dbl("r.squared")
 ```
 

README.md

@@ -51,7 +51,7 @@ library(purrr)
 mtcars |> 
   split(mtcars$cyl) |>  # from base R
   map(\(df) lm(mpg ~ wt, data = df)) |> 
-  map(summary) %>%
+  map(summary) |>
   map_dbl("r.squared")
 #>         4         6         8 
 #> 0.5086326 0.4645102 0.4229655

purrr.Rproj

@@ -19,5 +19,3 @@ BuildType: Package
 PackageUseDevtools: Yes
 PackageInstallArgs: --no-multiarch --with-keep.source
 PackageRoxygenize: rd,collate,namespace
-
-UseNativePipeOperator: Yes

tests/testthat/_snaps/list-transpose.md

@@ -64,3 +64,11 @@
       Error in `list_transpose()`:
       ! `template` must be a character or numeric vector, not a function.
 
+# fail mixing named and unnamed vectors
+
+    Code
+      test_list_transpose()
+    Condition
+      Error in `list_transpose()`:
+      ! Can't combine named and unnamed vectors.
+

tests/testthat/test-list-transpose.R

@@ -13,7 +13,7 @@ test_that("can use character template", {
   # Default:
   expect_equal(
     list_transpose(x, default = NA),
-    list(a = c(1, NA), b = c(2, 3))
+    list(a = c(1, NA), b = c(2, 3), c = c(NA, 4))
   )
 
   # Change order
@@ -130,3 +130,13 @@ test_that("validates inputs", {
     list_transpose(list(1), template = mean)
   })
 })
+
+test_that("fail mixing named and unnamed vectors", {
+  test_list_transpose <- function() {
+    x <- list(list(a = 1, b = 2), list(a = 3, b = 4))
+    list_transpose(list(x = list(a = 1, b = 2), y = list(3, 4)))
+  }
+  expect_snapshot(error = TRUE, {
+    test_list_transpose()
+  })
+})

vignettes/base.Rmd

@@ -281,9 +281,9 @@ The pipe is particularly compelling when working with longer transformations.
 For example, the following code splits `mtcars` up by `cyl`, fits a linear model, extracts the coefficients, and extracts the first one (the intercept).
 
 ```{r, eval = modern_r}
-mtcars %>% 
-  split(mtcars$cyl) %>% 
-  map(\(df) lm(mpg ~ wt, data = df)) %>% 
-  map(coef) %>% 
+mtcars |>
+  split(mtcars$cyl) |> 
+  map(\(df) lm(mpg ~ wt, data = df))|> 
+  map(coef) |> 
   map_dbl(1)
 ```

vignettes/other-langs.Rmd

@@ -23,7 +23,7 @@ purrr draws inspiration from many related tools:
 
 However, the goal of purrr is not to try and simulate a purer functional programming language in R; we don't want to implement a second-class version of Haskell in R. The goal is to give you similar expressiveness to an FP language, while allowing you to write code that looks and works like R:
 
-* Instead of point free (tacit) style, we use the pipe, `%>%`, to write code 
+* Instead of point free (tacit) style, we use the pipe, `|>`, to write code 
   that can be read from left to right.
 
 * Instead of currying, we use `...` to pass in extra arguments.