What is the precedence of the new |> pipe operator? I don't see it mentioned in ?Syntax, nor does it come up when I search the R Language Definition document. -- Sent from my phone. Please excuse my brevity.
I didn?t know R had a new pipe operator, but I have seen ?|>? (without quotes) used in the Elixir language though. Are there now two? ?%>%? from the magrittr package and ?|>? which is built-in?> On May 22, 2021, at 5:26 PM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote: > > ?What is the precedence of the new |> pipe operator? I don't see it mentioned in ?Syntax, nor does it come up when I search the R Language Definition document. > -- > Sent from my phone. Please excuse my brevity. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.
On 22/05/2021 8:26 p.m., Jeff Newmiller wrote:> What is the precedence of the new |> pipe operator? I don't see it mentioned in ?Syntax, nor does it come up when I search the R Language Definition document. >It's the same precedence as the %any% operators listed in the ?Syntax table, so it matches the magrittr pipe priority. You can see this in the source if you know how to read Bison, or determine it experimentally: > 2 * 3 |> print() [1] 3 [1] 6 This is the same result as 2 * ( 3 |> print() ) so it has higher priority than * . On the other hand, > 2 : 3 |> print() [1] 2 3 is the same as ( 2 : 3 ) |> print() so it has lower priority than : . A difference with the magrittr operator is in debugging. If an error happens in the middle of a pipe, I find the traceback a little easier to understand with the built-in pipe: > 2 |> print() |> stop() |> mean() [1] 2 Error in mean(stop(print(2))) : 2 > traceback() 2: stop(print(2)) 1: mean(stop(print(2))) versus > 2 %>% print() %>% stop() %>% mean() [1] 2 Error in mean(.) : 2 > traceback() 3: stop(.) 2: mean(.) 1: 2 %>% print() %>% stop() %>% mean() Duncan Murdoch