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John Carmack on mutable variables

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498 points azhenley | 3 comments | 31 Oct 25 02:34 UTC | HN request time: 0.001s | source
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acdbddh ◴[31 Oct 25 14:03 UTC] No.45772097[source]▶
In python its common to see code like this:

  df = pd.concat(df,other_df)
  df = df.select(...)
  ...
My eyes hurts, when I see it. It makes me avoid python. I bet the reason for this mutable code is a missing simple pipes syntax. I love pipes. In R can do:

  df |> 
    rbind(other_df) |> 
    select(...)
It feels much better.
replies(5): >>45772142 #>>45772222 #>>45772564 #>>45772704 #>>45776281 #
leviathan ◴[31 Oct 25 14:59 UTC] No.45772704[source]▶
My eyes would hurt more if I had to look all day at the vertical misalignment of that |> operator
replies(1): >>45772843 #
1. kec ◴[31 Oct 25 15:07 UTC] No.45772843[source]▶
You could always switch to a better font like Fira Code which has a ligature for this.
replies(1): >>45774463 #
2. adregan ◴[31 Oct 25 17:25 UTC] No.45774463[source]▶
The gp's comment wasn't made regarding the look of the operator in its ascii representation `|>` but about the vertical misalignment.

Typically you align a pipeline like so:

     df
     |> rbind(other_df)
     |> select(...)
But these topics are largely left to code formatters these days.
replies(1): >>45778757 #
3. kec ◴[01 Nov 25 02:22 UTC] No.45778757[source]▶
Weird, I have always aligned as the gp showed. I’m reasonably sure tidyverse documentation does the same (which is probably where we both picked it up from).