renanmuniz
[newbie here] Strange caracter while using Enum.chunk_every command in iex
Hi people!
I’ve just started learning Elixir this week.
I executed this command in iex and the console output was really strange, could anyone tell me why?
Command:
Enum.chunk_every([1,2,3,4,5,6,7,8,9,10,11,12,13,14], 2)
Return:
[[1, 2], [3, 4], [5, 6], ~c"\a\b", ~c"\t\n", ~c"\v\f", [13, 14]]
What happened to the numbers 7,8,9,10,11 and 12?
Thank you all and have a great day!
Marked As Solved
shawn_leong
Hey @renanmuniz,
What’s happening is that [7,8], [9,10], [11, 12] are being interpreted as Charlists.
A charlist is a list of integers where all the integers are valid code points.
To see it as non-charlists, you can try piping it the result of your Enum.chunk_every/2 into an inspect/2 function.
inspect(result, charlists: :as_list)
Also Liked
LostKobrakai
If you’re interested in the underlying integer values, yes. The problem is that erlang (being the system underlying elixir) does use charlists for text, which you generally also want to be able to read (and not see a list of numbers). Therefore elixir uses a heuristic to figure out which one you might be interested in. That heuristic is imperfect, but better than not having it.
You can find that discussed more elaborately in the docs: List — Elixir v1.20.2
smathy
dimitarvp
Yes, kind of. Though in real production systems you want logging and telemetry traces / spans.
As for development environment, you can just create the file .iex.exs in your project’s root directory and put this there:
IEx.configure(inspect: [charlists: :as_list])
And you’ll have that behaviour for your each local iex session.
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dimitarvp
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