minhajuddin

minhajuddin

Pattern match a struct using %_{}, How does that work?

I have seen the pattern %_{} being used to match against structs (notice the _ after the %).
Is this documented somewhere? It seems to match structs but I’d like to know if I am misisng something.

Marked As Solved

NobbZ

NobbZ

I’m not sure if there is real documentation around this. But at least, I found in the 1.3.0 changelog this:

  • [Kernel] Allow variable struct names when matching, for example, %module{key: "value"} = struct

For me this implies more or less, that I can also use _ as a name to bind to.

10
Post #2

Where Next?

Popular in Questions Top

shahryarjb
Hello, I get Persian date from my client and convert it to normal calendar like this: def jalali_string_to_miladi_english_number(persi...
New
albydarned
Hello all! I am typing this post from my new MacBook Pro with the M1 chip. I’m loving it so far, and will probably use it as my daily dr...
New
aalberti333
As the title describes, I’m trying to run Enum.map() over a list of key/value pairs, where the value is a map. My data looks like this: ...
New
Harrisonl
We have an ECS cluster with 4 services, where each task joins a single cluster, via discovery ECS discovery service. Currently when I de...
New
mcarvalho
What is the difference between System.get_env and Application.get_env? For example, what are best practices to use one versus another.
New
chensan
I have a User schema with a :from_id field set to type :string: defmodule TweetBot.Repo.Migrations.CreateUsers do use Ecto.Migration ...
New
qwerescape
Is there a way to get the call stack or stack trace at any point in the code? Not from exceptions, but an expression that returns how the...
New
fireproofsocks
Forgive me if this is obvious, but how does one delete a database record WITHOUT selecting it first? https://hexdocs.pm/ecto/Ecto.Repo.h...
New
beno
I will often find my self writing things similar to: case some_value do nil -> something() "" -> something() _ -> someth...
New
skosch
To my knowledge, put_in, Map.update etc. all have the one limitation of not automatically creating intermediate keys when needed (for exa...
New

Other popular topics Top

JakeBecker
TL;DR: I’ve just released an implementation of Microsoft’s IDE-independent Language Server Protocol for Elixir. It adds language support ...
1140 51847 244
New
bsollish-terakeet
Credo is smart enough to check for (something like) this: assert length(the_list) == 0 with this response: Checking if an enum is empt...
New
albydarned
Hello all! I am typing this post from my new MacBook Pro with the M1 chip. I’m loving it so far, and will probably use it as my daily dr...
New
sergio
I couldn’t find any guides that worked well with Phoenix 1.6.0 and esbuild. I hope this helps people test the waters and eases you into t...
New
quazar
How to set Jason to encode all fields in ecto schema, I don’t care about security and implementing only is taking long list of attributes...
New
SoCreat
i’m a new one to elixir which editor can i use vs code? or atom? Thanks! :smiley:
New
vac
Hi, I'm quite new in Elixir and I'm trying to format a string to a PEM format. I have the certificate value like MIIDBTCCAe2...... and ...
New
baxterw3b
Hi guys, i’m new in the Elixir world, and i have to say, that i love it! i’m having some problem to understand anonymous functions with ...
New
josevalim
Hi everyone, One of the features added to Elixir early on to help integration with Erlang code was the idea of overridable function defi...
New
vrod
I am using the Starship cross-shell prompt – it seems pretty nice, but I get some errors: [WARN] - (starship::utils): Executing command ...
New

We're in Beta

About us Mission Statement