Pipe second tuple member

Questions & Help Questions
1

In Dave Thoma’s programming book there is the following line of code:

IO.puts File.read!(​ *"* ​​ */usr/share/dict/words"* ​)
|> String.split

The exclamation mark ! returns the result, which would otherwise be returned in the {:ok, result} tuple.
This made me wonder if there is a method of piping only selected parameters to the next function in the pipe.

If I have:

{:ok, some_value} |> OI.puts      #Is there any way of printing the value of some_value?
2

There are some hex-packages available that claim to be able to deal with piping :ok tuples, but personally I tend to do one of the following (in order of preference):

  • Use with rather than piping
  • write a function that extracts the value and also deals with error
  • Use an anonymous function in the pipe
  • Pipe into elem/2

edit Add elem/2 to the list.

3 
File.read(​ *"* ​​ */usr/share/dict/words"* ​)
|> elem(1)
|> String.split()

No error checking or anything then, you might pipe an error value for example, with, the ok library, the exceptional library are all better at that.

4

Thanks.

Seems using elem as an intermediary is the easiest and dirtiest method of passing specific tuple elements.