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
Greetings from Membrane Framework team!
Check out our case study based on our latest projects at Software Mansion.
https://blog.swmansi...
New
New
So you’re enjoying using WebSockets with Elixir’s Phoenix Framework, and you want to send some binary messages. Maybe it’s an audio clip,...
New
I’ve spent the last year building keyboards, which has included writing firmware for a variety custom circuit boards.
I initially wrote ...
New
Summary: I describe a simple interview problem (counting frequencies of unique words), solve it in various languages, and compare perform...
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
Another week, another oldies-but-goldies post…
This one about Test Driven Development.
New
Hi there!
Recently I was playing around with extracting and updating data in the DB and for fun challenged myself to try to implement a ...
New
Does the world need another How to create a blog article?
Maybe not.
But then again, creating something out of nothing is what we love....
New
For the past few years, Safari has been putting in a lot of effort to enhance its WebAssembly support and 2024 was no exception… I believ...
New
Other popular topics
I’m thinking of buying a monitor that I can rotate to use as a vertical monitor?
Also, I want to know if someone is using it for program...
New
SpaceVim seems to be gaining in features and popularity and I just wondered how it compares with SpaceMacs in 2020 - anyone have any thou...
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
Thanks to @foxtrottwist’s and @Tomas’s posts in this thread: Poll: Which code editor do you use? I bought Onivim! :nerd_face:
https://on...
New
Saw this on TikTok of all places! :lol:
Anyone heard of them before?
Lite:
New
We’ve talked about his book briefly here but it is quickly becoming obsolete - so he’s decided to create a series of 7 podcasts, the firs...
New
Build efficient applications that exploit the unique benefits of a pure functional language, learning from an engineer who uses Haskell t...
New
There appears to have been an update that has changed the terminology for what has previously been known as the Taskbar Overflow - this h...
New
If you’re getting errors like this:
psql: error: connection to server on socket “/tmp/.s.PGSQL.5432” failed: No such file or directory ...
New
Categories:
Sub Categories:
Popular Portals
- /elixir
- /rust
- /ruby
- /wasm
- /erlang
- /phoenix
- /keyboards
- /python
- /js
- /rails
- /security
- /go
- /swift
- /vim
- /clojure
- /emacs
- /haskell
- /java
- /svelte
- /onivim
- /typescript
- /kotlin
- /c-plus-plus
- /crystal
- /tailwind
- /react
- /gleam
- /ocaml
- /flutter
- /elm
- /vscode
- /ash
- /opensuse
- /html
- /centos
- /zig
- /deepseek
- /php
- /scala
- /textmate
- /react-native
- /lisp
- /sublime-text
- /debian
- /nixos
- /agda
- /kubuntu
- /arch-linux
- /django
- /deno
- /revery
- /nodejs
- /ubuntu
- /manjaro
- /spring
- /diversity
- /lua
- /julia
- /markdown
- /slackware








