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
Ten years without Elixir.
I never got into Elixir, largely because it looked like Ruby. I was a Rubyist for a good while, spent time and...
New
Why Zig When There is Already C++, D, and Rust?
No hidden control flow
No hidden allocations
First-class support for no standard library...
New
Just finished doing a clean install of macOS (which I highly recommend btw!) and have updated my macOS Ruby & Elixir/Erlang dev env s...
New
Idioms for the D Programming Language
This thread was posted by one of our members via one of our news source trackers.
New
This post explains why Scala projects are difficult to maintain.
Scala is a powerful programming language that can make certain small te...
New
Just a small test with lists in cython.
Considering echosystem, multithreading and ease of use, Julia is a clear winner here.
New
This post is a spiritual successor to Loris Cro’s Go cross-compilation.
The encounter
During a recent stage 2 meeting Jakub Konka wanted...
New
Ruby’s Struct is one of several powerful core classes which is often overlooked and under utilized compared to the more popular Hash clas...
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
Elixir language viewed from the perspective of a JavaScript developer. I compared selected aspects of the two languages and touched on to...
New
Other popular topics
Reading something? Working on something? Planning something? Changing jobs even!?
If you’re up for sharing, please let us know what you’...
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
New
Create efficient, elegant software tests in pytest, Python's most powerful testing framework.
Brian Okken @brianokken
Edited by Kat...
New
Use WebRTC to build web applications that stream media and data in real time directly from one user to another, all in the browser.
...
New
I am trying to crate a game for the Nintendo switch, I wanted to use Java as I am comfortable with that programming language. Can you use...
New
If you want a quick and easy way to block any website on your Mac using Little Snitch simply…
File > New Rule:
And select Deny, O...
New
Author Spotlight
Erin Dees
@undees
Welcome to our new author spotlight! We had the pleasure of chatting with Erin Dees, co-author of ...
New
Inside our android webview app, we are trying to paste the copied content from another app eg (notes) using navigator.clipboard.readtext ...
New
Author Spotlight:
Bruce Tate
@redrapids
Programming languages always emerge out of need, and if that’s not always true, they’re defin...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /wasm
- /ruby
- /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
- /react-native
- /lisp
- /sublime-text
- /textmate
- /nixos
- /debian
- /agda
- /django
- /deno
- /kubuntu
- /arch-linux
- /nodejs
- /revery
- /ubuntu
- /spring
- /manjaro
- /diversity
- /lua
- /julia
- /markdown
- /v









