Questions & Help>Questions

Pipe second tuple member

#learning-elixir
LukasWorld

LukasWorld

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?
3 comments
#learning-elixir
5085 3

Marked As Solved

OvermindDL1

OvermindDL1 

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.

2
Post #2

Also Liked

NobbZ

NobbZ

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
Post #1
LukasWorld

LukasWorld OP

Thanks.

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

3
Post #3

Where Next? Top

View thread on forum (has 3 replies!)
learning-elixir
Home Questions & Help>Questions
8 5028 3
Last post
REPLY VIEW THREAD WITH 3 POSTS

Trending in Questions Top

RSP87
Questions & Help>Questions

Programming Phoenix chat example - iPhone lack of socket updates
I’m working on a project that simulates the bumbl example in the programming phoenix book. It acts almost like an email client. We have a...
/phoenix#troubleshooting
1 950 6
New
kpanic
Questions & Help>Questions

"Mentoring" match maker? maybe MVP
Hi everyone, I am toying with the idea of building a “match maker” for giving personal help to people that wants to start coding. I sta...
#helpers#programming
8 940 4
New
nseaSeb
Questions & Help>Questions

What's the approach for handling lists that allows for optimized traversal?
Hello, I know there is an approach for handling lists that allows for optimized traversal, but I can’t recall the specific method (somet...
#learning-elixir#list
13 419 15
New
brecabral
Questions & Help>Questions

Scoped Routes section of the Phoenix guides refers to a problem without explaining what it is ("but there is a problem")
Documentation While reading the Scoped Routes section, I noticed that the documentation currently refers to a problem without explainin...
/phoenix
6 829 4
New
velrest
Questions & Help>Questions

`:erlang.float` vs `value * 1.0`: Which is the prefered way?
So my question is quite simple and i have found no conclusive answer on forum, google or AI. Should we use :erlang.float for Integer to ...
#learning-elixir
12 638 5
New
asweet-confluent
Questions & Help>Questions

Why is Logger's default level :debug?
I recently noticed that Elixir’s Logger defaults its primary log level to :debug when no :logger, :level application configuration is pre...
#logging#logger
13 504 10
New
apz
Questions & Help>Questions

Vscode elixirLS setup - want to fix/understand "couldn't create connection to server"
I’m new to elixir and just tried to install the elixirLS extension for VScode(ium) and it is throwing some errors that I would like help ...
#learning-elixir#vscode#elixir-ls
0 144 3
New

Other Trending Topics Top

GenericJam
News>Announcing

Mob - Native BEAM / Elixir on Native Mobile
Edit: 2026 May 15 - This post is archived. Mob is alive!! Main docs: mob v0.7.11 — Documentation A bit of explanation for the slightly c...
/mob#library#beam#mobile#liveview#react-native#mobile-app#mobile-development
256 7926 107
New
JesseHerrick
News>Announcing

Dexter - A fast, full-featured Elixir LSP optimized for large codebases
Hey, I’m Jesse and I’m the main contributor behind Dexter, a full-featured, lightning-fast Elixir LSP optimized for large codebases. It s...
#library#lsp#dexter
187 6988 64
New
mudasobwa
Chat & Discussions>Discussions

Cure - a new language compiled to BEAM
I am happy to introduce the very α version of the new programming language compiled to BEAM. Welcome Cure. It has literally three kille...
#static-types#type-checking#types#fsm
171 6315 70
New
marciok
News>Announcing

Gust - A task orchestration system built in Elixir
Hi there! We created Gust: A task orchestrator inspired by Airflow. For those who have never heard about Aiflow, it’s a Python-based wor...
/phoenix/oban#library#workflow#background_job#reactor
111 4469 40
New
mhanberg
Chat & Discussions>Discussions

Expert LSP is now available!
Hi everyone! The first release candidate for the Expert language server project is now available! We’ve published a press release detai...
#lsp#expert
220 4348 38
New
jimsynz
News>Announcing

Beam Bots - Resilient Robotics on the BEAM
Beam Bots (or just BB for short) is a framework for building fault-tolerant robotics applications in Elixir using familiar OTP patterns. ...
/beam-bots#library#robotics#bb
119 2916 28
New
Back to top

Questions & Help>Questions

Questions Questions ❯

Latest on Elixir Forum

Elixir Forum ❯

Sponsor Spotlight

Code Sync

Elixir, Erlang & messaging conferences from Code Sync. Next up: ElixirConf US (10–11 Sep) & Code BEAM Europe (21–22 Oct), Haarlem + online.

Our Sponsors

EEF

Supporting innovation across the BEAM ecosystem.

Coders51

We build reliable cloud platforms for business-critical systems.

AppSignal

Catch errors, track performance, monitor hosts and more.

Honeybadger

Error tracking, logs, uptime, and Just Enough APM. Built for developers.

Code Sync

Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

WyeWorks

**Building the future of software with AI, trust, and human connection.**

Potions

The deployment platform built for Elixir: PaaS ease, VPS control.

Software Mansion

The team behind Membrane, Popcorn, LiveDebugger. Available for hire.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

Categories:

Sub Categories:

Forums

Popular Tags

Our Sponsors

EEF

Supporting innovation across the BEAM ecosystem.

Coders51

We build reliable cloud platforms for business-critical systems.

AppSignal

Catch errors, track performance, monitor hosts and more.

Honeybadger

Error tracking, logs, uptime, and Just Enough APM. Built for developers.

Code Sync

Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!

Pragmatic Bookshelf

Practical resources that improve the lives of professional developers.

WyeWorks

**Building the future of software with AI, trust, and human connection.**

Potions

The deployment platform built for Elixir: PaaS ease, VPS control.

Software Mansion

The team behind Membrane, Popcorn, LiveDebugger. Available for hire.

Pragmatic Studio

Courses that'll move you from confusion to "Aha, now I get it!"

View all our sponsors ❯

We're in Beta

About us Mission Statement

Options

Thread Display Mode




Thread Preview

Skip Thread Previews