Debugging elixir efficently

A 10 minutes walk through of Erlang's built-in tools (:debugger and :obverser) to help you debug your elixir code efficiently.

Transcript

1. Debugging elixir efficiently
2. Guillaume Cauchon @gcauchon @Mirego @alagarderie
3. Debugging techniques in Elixir Solid Ground // Saša Jurić Empex 2017
4. > IO.puts/2 IO.inspect/2 Apex.ap/2
6. IEx.pry
8. :debugger
9. iex(1)> :debugger.start() {:ok, #PID<0.156.0>} iex(2)> :int.ni(Demo) {:module, Demo} iex(3)> :int.break(Demo, 14) :ok iex(4)>
11. iex(1)> Demo.fibonacci(10) 55 iex(2)> Demo.fibonacci(50) 12586269025 iex(3)> Demo.fibonacci(99) 218922995834555169026 iex(4)> Demo.fibonacci(-10)
14. :observer
15. iex(1)> Demo.fibonacci(-10) …
16. > iex --erl "+S 1" -S mix * iex(1)> :observer.start() :ok iex(2)> Demo.fibonacci(20) 6765 iex(3)> Demo.fibonacci(99) 218922995834555169026 iex(4)> Demo.fibonacci(-1) … * Start the Erlang VM with a single process scheduler to demonstrate the infinite loop more explicitly.