MeerKatDev
Weird behaviour of Enum.chunk_every
I met some weird behaviour of this function:
Erlang/OTP 22 [erts-10.4.4] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [hipe]
Interactive Elixir (1.9.1) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)>
nil
iex(2)> Enum.chunk_every([1,2,3,4,5],2)
[[1, 2], [3, 4], [5]]
iex(3)> Enum.chunk_every([1,2,3,4,5,6,7,8,],2)
[[1, 2], [3, 4], [5, 6], '\a\b']
iex(4)> Enum.chunk_every([1,2,3,4,5,6,7,8,9,10,11],2)
[[1, 2], [3, 4], [5, 6], '\a\b', '\t\n', '\v']
iex(5)> Enum.chunk_every([1,2,3,4,5,6,7,8,9,10,11,14],2)
[[1, 2], [3, 4], [5, 6], '\a\b', '\t\n', [11, 14]]
iex(6)> Enum.chunk_every([1,2,3,4,5,6,7,8,9,10,11,12,1314],2)
[[1, 2], [3, 4], [5, 6], '\a\b', '\t\n', '\v\f', [1314]]
iex(7)> Enum.chunk_every([1,2,3,4,5,6,7,8,9,10,11,12,13,14],2)
[[1, 2], [3, 4], [5, 6], '\a\b', '\t\n', '\v\f', [13, 14]]
Why does it do like that? My OS is Xubuntu 18.04.
Marked As Solved
isaac-rstor
Single quotes are character lists, how “strings” are handled in erlang. When your integers enter the printable ASCII range, elixir thinks they are character lists, converts the values to ASCII, and drops them inside the single quotes instead of the brackets.
Also Liked
OvermindDL1
If you are ever curious about something like '\t\n' but an i and a space in front of it in IEx, like:
iex(1)> i '\t\n'
Term
'\t\n'
Data type
List
Description
This is a list of integers that is printed as a sequence of characters
delimited by single quotes because all the integers in it represent valid
ASCII characters. Conventionally, such lists of integers are referred to
as "charlists" (more precisely, a charlist is a list of Unicode codepoints,
and ASCII is a subset of Unicode).
Raw representation
[9, 10]
Reference modules
List
Implemented protocols
Collectable, Enumerable, IEx.Info, Inspect, List.Chars, String.Chars
Note the Raw Representation.
1
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