I wonder if precomputing the whole array of “primes up to 1,000,000” and putting it in a module attribute would count as “cheating”

defmodule VeryCheatingMuchFast do
  @all_the_primes ComputePrimes.all(1_000_000)

  def all_the_primes do
    @all_the_primes
  end
end

Warning: I’m not a wiz kid.

The docker part ist easy and docker is also a handy tool to have in your toolbox.

Say you have a script prim.exs in the working directory

# calculate a prime number and print it out
IO.puts(1+1)

Check that you can run it with elixir prim.exs.

Then you can just run this script inside docker with

docker run -it --rm -v "$PWD":/prim -w /prim elixir:alpine elixir prim.exs

docker will automatically fetch the image “elixir:alpine” from elixir - Official Image | Docker Hub. -v and -w do some magic so that docker sees the host-filesystem. The last part just runs the script inside the container.

• install docker: Get Docker | Docker Docs
• docker+elixir: Running Elixir in Docker Containers

Wow, cdesch just added the solution for Elixir. Primes/PrimeElixir/solution_1 at drag-race · PlummersSoftwareLLC/Primes · GitHub