Elixir’s interactive shell.
iex is Elixir’s interactive shell, which can be used to interactively run Elixir code from the command line.
Questions tagged [elixir-iex]
150 questions
1
vote
1 answer
Unexpected tail value after destructuring List of integers in Elixir
iex(1)> [foo|bar] = [2,3,4,5,6,7]
[2, 3, 4, 5, 6, 7]
iex(2)> foo
2
iex(3)> bar
[3, 4, 5, 6, 7]
iex(4)> [foo|bar] = [6,7,8]
[6, 7, 8]
iex(5)> foo
6
iex(6)> bar
'\a\b'
I would have expected bar to be [7,8] in the end, however it has the value…
P Varga
- 19,174
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1
vote
1 answer
undefined function sigil_I/2 (there is no such import)
I am working on RDFGraph using elixir.
I am running the following command on iex:
iex(1)> DC.format(~I, ~L"Paper")
and get this error:
** (CompileError) iex:1: undefined function sigil_I/2 (there is no such import)
The…
munim
- 33
- 10
1
vote
1 answer
iex.iexs file is not loading on test environment
I'am trying to load the iex.iexs file when debugging a test. I created an alias in Mix.exs that tries to import it.
defp aliases do
[
...,
"ex.file": [&import_iex_file/1, "compile"]
]
end
defp import_iex_file(_var) do
…
Lilith
- 13
- 3
1
vote
0 answers
How do I import .iex.exs automatically before hitting a pry breakpoint in iex?
When starting iex normally (iex -S mix or iex), it will run the .iex.exs file in the current directory (or ~/.iex.exs). If running tests, if there is a pry (require IEx; IEx.pry) it will pause execution and open a prompt. However this means that…
Freedom_Ben
- 11,247
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1
vote
1 answer
Elixir/Erlang: Error when a variable list merge with many other lists
I have this function:
defp get_list(map, l, i) do
list = l ++ map
where map is the new list who comes every repetition, so l is merged with it and attributed to list
it works great for a small number of pages, the problem is when lots of pages…
Elielton Limeira
- 25
- 7
1
vote
3 answers
How to start Phoenix server when you are already in iex?
I know we can launch iex -S mix phoenix.server. But say I am already in iex -S mix. What can I do to get the server started?
Thank you.
user3066199
- 33
- 6
1
vote
3 answers
Elixir: How to get bit_size of an Integer variable?
I need to get the size of bits used in one Integer variable.
like this:
bit_number = 1
bit_number = bit_number <<< 2
bit_size(bit_number) # must return 3 here
the bit_size/1 function is for 'strings', not for integers but, in the exercise, whe…
Sérgio B.
- 35
- 6
1
vote
2 answers
Elixir IEx shell, how to break out of current `receive` block
I'm new to elixir, experimenting around in iex shell to learn, and I have be a noob question.
For simplicity let's call the current shell session process the "main process".
I spawn a child process, write a receive block in "main process" to listen…
hackape
- 18,643
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1
vote
3 answers
wxmac elixir error when trying to run :observer.start in iex
After running :observer.start in iex I received the follwing messages. I tried uninstalling and reinstalling both Elixir and Homebrew but to no avail.
objc[58977]: Class wxNSProgressIndicator is implemented in both…
Kenny
- 21
- 1
- 2
1
vote
2 answers
Force carriage returns in IEx Ports' stderr?
If I open a Port in IEx for a script that prints anything to stderr, none of the output is printed with carriage returns. How can I fix this? I am running external software whose output I cannot control, so I can't just add the returns…
Ian Hunter
- 9,466
- 12
- 61
- 77
1
vote
1 answer
How can I run batch in a shell?
I want to have a batch file that opens the command prompt, launches the iex shell within it and then starts my elixir program. The issue I'm having is that as soon as I invoke iex -S mix, which compiles the code and opens the elixir shell, then I am…
C. K.
- 71
- 1
- 11
1
vote
1 answer
Elixir regex matching literal backslash
Surprisingly the regex matcher does not match backslash correcly. For example
Regex.split(~r{\\}, "C:\foo\bar")
["C:\foo\bar"]
Regex.match?(~r/\\/, "C:\foo\bar")
false
I would expect a positive match, but maybe I'm escaping \ wrong. Let's test…
Arijoon
- 2,184
- 3
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- 32
1
vote
2 answers
How to retrieve all of the loaded modules in `iex`?
I wanted to know if there was a standard NotImplementedError I could pass to Kernel.raise/1. I was curious whether I could figure out (beyond just trying it) whether that module existed.
More generally, it seems useful to be able to search or even…
Kenny Evitt
- 9,291
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- 93
1
vote
1 answer
Fixing arrow keys in IEX in TMUX session
I use TMUX and vim for everything, and recently started working with Elixir. Whenever I run an elixir process, including iex -S mix, I cannot use the error keys as it instead prints out ^[[A for the up arrow, ^[[B for the down arrow, etc.
How can I…
cadlac
- 2,802
- 3
- 18
- 34
1
vote
2 answers
(Ecto.Query.CompileError) Tuples can only be used in comparisons with literal tuples of the same size. - Elixir
Where I'm at
For this example, consider Friends.repo
Table Person has fields :id, :name, :age
Example Ecto query:
iex> from(x in Friends.Person, where: {x.id, x.age} in [{1,10}, {2, 20}, {1, 30}], select: [:name])
When I run this, I get relevant…
Kaushik Evani
- 1,154
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