Im trying reproduce the example of module-based task like the example Task — Elixir v1.20.2 in my try https://github.com/luizamboni/elixir-study/blob/master/otp/5-task/module-task.exs What is wrong ? Thanks!

The docs are wrong. number = 5 Supervisor.start_link([{TaskModule, number}], strategy: :one_for_one) Since your module takes a number and adds 2 to it, we’re passing in a number (5) as the argument. You can pass in whatever you like. See also: Supervisor — Elixir v1.20.2

Can you show your supervisor as well?

i m not using module based Supervisor

Sou you are just doing elixir yourscript? Then your script ends even before the supervisor has fully started. Or what exactly is your problem?

ow…excuse-me i forgive to explain the error ! I got this error in shell: ** (UndefinedFunctionError) function Task.__using__/1 is undefined or private (elixir) Task.__using__([]) module-task.exs:3: (module) module-task.exs:1: (file)

Probably your elixir is to old. I checked branches and Task.__using__/1 only exists in 1.5 branch.

As you can see, Task.__using__/1 does not exist in v1.4.2, so if you want to use it, you need to update. https://github.com/elixir-lang/elixir/blob/v1.4.2/lib/elixir/lib/task.ex Also you can take a look at the documentation of 1.4.2, the example there does not mention any use of use :wink: …

i update to 1.5.2 like a doc i m read But now i got other error: ** (UndefinedFunctionError) function Supervisor.start_link/1 is undefined or private. Did you mean one of: * start_link/2 * start_link/3 but It is exact like the doc…

thank you ! this forum is observed by core team ? We can alert about this. Is a trouble for newbies

Elixir Programming Language Forum

How to create module based Tasks

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luizamboni October 12, 2017, 9:40pm 10

Supervisor.start_link/1 not exists…

This doc like wrong…