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
This article was written by @rvirding …over a decade ago! Posting here in case anyone else finds it of interest and adding it to our Erla...
New
Is Zig the Long Awaited C Replacement.
Comparison with previous C contenders such as C++, D, Java, C#, Go, Rust and Swift
https://erik...
New
Over the last few years, due in large part to the hype surrounding blockchain and cryptocurrencies, decentralized applications have gaine...
New
Creation vs. Evolution
Consider the history of Elixir: first you take Erlang, which was invented by Joe Armstrong and team to solve the ...
New
I discovered Elixir and Go at about the same time (2019). I had pivoted almost eight years of working as a Java developer, and part of me...
New
I don’t like reading thick O’Reilly books when I start learning new programming languages. Rather, I like starting by writing small and d...
New
In episode 83 of Thinking Elixir, We talk with Isaac Yonemoto about the Zig language and his Zigler Elixir library. We learn where Zig ca...
New
In building lofi.limo, media storage and distribution naturally came up. I have songs, announcements, and background image loops which I ...
New
In this blog post over on Fly.io I take a look at PHP 8.1’s new Enum class, and show you how it can be used to set up a level structure f...
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
If it’s a mechanical keyboard, which switches do you have?
Would you recommend it? Why?
What will your next keyboard be?
Pics always w...
New
Algorithms and data structures are much more than abstract concepts. Mastering them enables you to write code that runs faster and more e...
New
Ruby, Io, Prolog, Scala, Erlang, Clojure, Haskell. With Seven Languages in Seven Weeks, by Bruce A. Tate, you’ll go beyond the syntax—and...
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
Learn different ways of writing concurrent code in Elixir and increase your application's performance, without sacrificing scalability or...
New
The V Programming Language
Simple language for building maintainable programs
V is already mentioned couple of times in the forum, but I...
New
Saw this on TikTok of all places! :lol:
Anyone heard of them before?
Lite:
New
New
Will Swifties’ war on AI fakes spark a deepfake porn reckoning?
New
This is cool!
DEEPSEEK-V3 ON M4 MAC: BLAZING FAST INFERENCE ON APPLE SILICON
We just witnessed something incredible: the largest open-s...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /crystal
- /c-plus-plus
- /tailwind
- /react
- /gleam
- /ocaml
- /elm
- /flutter
- /vscode
- /ash
- /html
- /opensuse
- /zig
- /centos
- /deepseek
- /php
- /scala
- /react-native
- /lisp
- /textmate
- /sublime-text
- /nixos
- /debian
- /agda
- /django
- /kubuntu
- /deno
- /arch-linux
- /nodejs
- /revery
- /ubuntu
- /spring
- /manjaro
- /lua
- /diversity
- /julia
- /markdown
- /slackware








