Enum.chunk_every/2 strange results

[pbudzik]

Environment

• Erlang/OTP 20 [erts-9.2] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Elixir 1.7.0-dev (97cf609) (compiled with OTP 20)

• Operating system: MacOS Sierra

Current behavior

x = Enum.chunk_every([9, 9, 1, 0, 0], 1)
IO.inspect(x)

['\t', '\t', [1], [0], [0]]

Expected behavior

[[9],[9], [1], [0], [0]]

[wojtekmach]

note:

iex> [[9],[9], [1], [0], [0]]
['\t', '\t', [1], [0], [0]]

iex> [9]
'\t'

so nothing to do with chunk_every. Elixir attempts to print this as a list of characters, see iex> i [9] for more information.

[pbudzik]

Good to know...but should not IO.inspect correctly serialize to string? How can I print it correctly then ? 2018-01-26 10:43 GMT+01:00 Wojtek Mach <notifications@github.com>:

…

note: iex> [[9],[9], [1], [0], [0]] ['\t', '\t', [1], [0], [0]] iex> [9] '\t' so nothing to do with chunk_every. Elixir attempts to print this as a list of characters, see iex> i [9] for more information. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#7260 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AANsahC0kiFrJKXg7XzIK8oGj0pixUdeks5tOZ5agaJpZM4RuD2Z> .

[wojtekmach]

iex> IO.inspect [9], charlists: :as_lists
[9]
'\t'

note this prints what you'd expect, but returns the default representation. If you need to return a string you can do:

iex> inspect [9], charlists: :as_lists
"[9]"

This is documented in https://hexdocs.pm/elixir/IO.html#inspect/2, https://hexdocs.pm/elixir/Inspect.Opts.html

[michalmuskala]

See a good explanation here https://github.com/elixir-lang/elixir/wiki/FAQ#4-why-is-my-list-of-integers-printed-as-a-string For the reasons behind this design, look at this mailing list thread https://groups.google.com/forum/#!msg/elixir-lang-talk/0xxH9HxdQnU/LHgK8elhEQAJ

[pbudzik]

Thanks alot! Please close the ticket. 2018-01-26 10:56 GMT+01:00 Michał Muskała <notifications@github.com>:

…

See a good explanation here https://github.com/elixir- lang/elixir/wiki/FAQ#4-why-is-my-list-of-integers-printed-as-a-string For the reasons behind this design, look at this mailing list thread https://groups.google.com/forum/#!msg/elixir-lang-talk/ 0xxH9HxdQnU/LHgK8elhEQAJ — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#7260 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AANsav95IiluCKsWLPPTYANDgr2vUF_wks5tOaFMgaJpZM4RuD2Z> .