たとえば、つぎのようにパイプ演算子|>で続く処理の間にIO.inspect/2を挟んで、値がどのように変わるのか確かめられます。これにより結果が変わることはありません。 defmodule Example do def square_sum(first, last) do for i <- first..last do i end |> IO.inspect |> Enum.map(fn x -> x * x end) |> IO.inspect |> Enum.sum end end
Elixir入門 21: デバッグ
たとえば、つぎのようにパイプ演算子|>で続く処理の間にIO.inspect/2を挟んで、値がどのように変わるのか確かめられます。これにより結果が変わることはありません。 defmodule Example do def square_sum(first, last) do for i <- first..last do i end |> IO.inspect |> Enum.map(fn x -> x * x end) |> IO.inspect |> Enum.sum end end
Debugging
There are a number of ways to debug code in Elixir. In this chapter we will cover some of the more common ways of doing so. IO.inspect/2 What makes IO.inspect(item, opts \\ []) really useful in debugging is that it returns the item argument passed to it without affecting the behavior of the original code. Let’s see an example. (1..10) |> IO.inspect |> Enum.map(fn x -> x * 2 end) |> IO.inspect |> E
Attach an iex session to running elixir/OTP process
That depends on how did you start your OTP application. To connect to the node it needs to be started with either --name or --sname flag. You can check the name of currently running session with node() $ iex Erlang/OTP 18 [erts-7.2.1] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false] Interactive Elixir (1.3.0) - press Ctrl+C to exit (type h() ENTER for help) iex(1)> node() :nonode
Elixir — quick reference for debugging techniques
“Red and black beetle climbs on purple plants in the wild” by Mahdi Shakhesi on Unsplash Much has been said about Elixir debugging techniques, but in this post, I’d like to give a quick overview of all possible options to serve as a go-to reference when you need to debug Elixir code. Enough talking, let’s check each of them: IO.inspectThe simplest technique: IO.inspect to printIO.inspect/2can also
稼働中の Elixir/Erlang アプリケーションをお手軽デバッグトレースできる erlyberly が超便利！ - Qiita
稼働中の Elixir/Erlang アプリケーションをお手軽デバッグトレースできる erlyberly が超便利！ErlangdebugElixir erlyberly って何？ erlyberly は、Erlang の他、Elixir, LFE (Lisp Flavoured Erlang - Elang VM 上で動作する Lisp) といった Erlang 系言語向けのデバッグトレースがビジュアルに出来る GUI ソフトウェア。Java で出来ているので JDK (8u20 以上が必要) が入っている環境であれば動作する。 百聞は一見に如かず、というわけで、まずはスクリーンショットから。 Erlang 系言語にはコマンドラインのデバッガは幾つかあるが、視覚的にデバッグ・トレースできるものは余り見当たらない。 豊富な機能 できることは GitHub の READ.md に貼られている
How to trace a GenServer’s Execution? Elixir
This article is for beginners especially who have been started playing with GenServer . Today, you are going to build an OTP server and you will trace the server using simple technique. This is not a technique, it is an option while calling the start_link/3 function. Talk is cheap, lets code it. What we do here ?We together implement the STACK server and will trace that server. As you know stack i
Elixir Remote Debugging
In Elixir, it's possible to connect nodes together to form a cluster in which all the nodes are visible to each other. This feature can be used to inspect and debug production apps running on remote nodes. Let's see how we can connect to an Elixir node running inside a docker container remotely from a local iex shell and use Erlang's debugger tool to set breakpoints and debug the code running in t
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