cgrothaus
3 different ways to build a list with conditional elements in Elixir (and what that has to do with application startup)
I wrote a blog post about 3 different ways to build a list with conditional elements in Elixir (and what that has to do with application startup).
Most Liked
Eiji
There are other ways to achieve such results for example using recursive functions.
defmodule Example do
def sample(list) do
List.foldr(list, [], fn
{false, _child_spec}, acc -> acc
{true, child_spec}, acc -> [child_spec | acc]
child_spec, acc -> [child_spec | acc]
end)
end
def sample2([]), do: []
def sample2([{false, _child_spec} | rest]), do: sample2(rest)
def sample2([{true, child_spec} | rest]), do: sample2([child_spec | rest])
def sample2([child_spec | rest]), do: [child_spec | sample2(rest)]
end
input = [:not_tuple, {false, :skip_me}, {true, :no_skip}]
Example.sample(input)
Example.sample2(input)
Helpful resources:
2
Popular Backend topics
Interested in a blazingly fast type checker with 25 years of investment, delivered on the BEAM? Check out Caramel, an exciting project fr...
New
It’s easy to view yourself as “not a real programmer.” There are programs out there that everyone uses, and it’s easy to put their develo...
New
Rails Best Practices I.
Today I share some of my favorite practices applicable to Ruby on Rails (and to web development on small teams g...
New
This post explains why Scala projects are difficult to maintain.
Scala is a powerful programming language that can make certain small te...
New
At Grammarly, the foundation of our business, our core grammar engine, is written in Common Lisp. It currently processes more than a thou...
New
This was posted on the Elixir Forum and thought it was worth sharing here!
I love how the excitement of the author shines through and I ...
New
Too long have we hustled to deploy Clojure websites. Too long have we spun up one server instance per site. Too long have reminisced abou...
New
I wrote Python for the last 10 years, and I always tend to write code in a “functional” way - map, filter, lambda and so on, it makes me ...
New
In episode 78 of Thinking Elixir, we talk with Chase Granberry about Logflare. We learn why Chase started the company, what Logflare does...
New
Peeper is the tiny library to preserve state across GenServer crashes/restarts.
Works as an almost drop-in substitute for GenServer, sui...
New
Other popular topics
Learn from the award-winning programming series that inspired the Elixir language, and go on a step-by-step journey through the most impo...
New
Design and develop sophisticated 2D games that are as much fun to make as they are to play. From particle effects and pathfinding to soci...
New
New
We have a thread about the keyboards we have, but what about nice keyboards we come across that we want? If you have seen any that look n...
New
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl:
The Ser...
New
Hello everyone! This thread is to tell you about what authors from The Pragmatic Bookshelf are writing on Medium.
New
Create efficient, elegant software tests in pytest, Python's most powerful testing framework.
Brian Okken @brianokken
Edited by Kat...
New
Author Spotlight
Dmitry Zinoviev
@aqsaqal
Today we’re putting our spotlight on Dmitry Zinoviev, author of Data Science Essentials in ...
New
Get the comprehensive, insider information you need for Rails 8 with the new edition of this award-winning classic.
Sam Ruby @rubys
...
New
Fight complexity and reclaim the original spirit of agility by learning to simplify how you develop software. The result: a more humane a...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /ruby
- /wasm
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /java
- /emacs
- /haskell
- /svelte
- /onivim
- /typescript
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /centos
- /deepseek
- /php
- /scala
- /lisp
- /react-native
- /textmate
- /sublime-text
- /nixos
- /debian
- /agda
- /django
- /kubuntu
- /deno
- /arch-linux
- /nodejs
- /ubuntu
- /revery
- /manjaro
- /spring
- /lua
- /diversity
- /julia
- /markdown
- /slackware








