alvises

# AoC 2022 in Elixir

alvises

IO.puts("I'm here! Sleeping for 2 seconds")

Process.sleep 2_000 # waiting for the other node

nodes = MapSet.new([:app@app1, :app@app2])
other_node = 
	nodes
	|> MapSet.delete(Node.self()) 
	|> MapSet.to_list() 
	|> List.first()

alvises

/* to add to assets/css/app.css */

.thumb-selected {
    border: 4px solid #0069d9;
}

.thumb-unselected {
    opacity: 0.5;
}

alvises

lines = File.stream!("file_path")
chunks = File.stream!("file_path",[],2_048)

hash_fun = fn enum ->
	enum
	|> Enum.reduce(:crypto.hash_init(:sha),&(:crypto.hash_update(&2, &1)))
	|> :crypto.hash_final()
	|> Base.encode16()
end

alvises

Related to the Elixirforum topic "Streaming lines from an enum of chunks"

Download sample file

You can find this 4.4M file at this url: https://poeticoding-data.sfo2.digitaloceanspaces.com/httpstream/numbers_small.txt

Dependencies

mix deps.get to download the dependencies (benchee)

Run the benchmark

alvises

defmodule Example do
  use GenServer

  def start_link(_) do
    GenServer.start_link __MODULE__, :ok, []
  end 

  def init(:ok) do
    {:ok, []}
  end

alvises

docker container run -p 8000:80 nginx

alvises

lazy_csv_fn = fn ->
	File.stream!("large.csv")
	|> Stream.map(&String.trim(&1))
	|> Stream.map(&String.split(&1, ","))
	|> Stream.filter(fn
	  ["Timestamp" | _] -> false
	  [_, "NaN" | _] -> false
	  [timestamp | _] ->
	    true
	end) |> Enum.find(fn

alvises

defmodule Coinbase.Client do
  use WebSockex

  @url "wss://ws-feed.pro.coinbase.com"

  def start_link(products \\ []) do
    {:ok, pid} = WebSockex.start_link(@url, __MODULE__, %{})
    subscribe(pid, products)
    {:ok, pid}
  end

alvises

.site-header {
  background: white !important;
  background-color: white !important;
}