fxn

require 'test_helper'

class UserTest < ActiveSupport::TestCase
  test "class names" do
    uid = User.object_id
    print "please modify the file and press ENTER "; gets
    assert_equal uid, User.object_id
  end
end

fxn

#!/bin/bash

docker container ls -a -q                 | xargs docker container rm
docker image ls -a -q                     | xargs docker image rm
docker volume ls -q                       | xargs docker volume rm
docker network ls -q --filter type=custom | xargs docker network rm

fxn

The Zeitwerk integration in Rails 6 has several parts.

1. First, we define a new configuration point Rails.configuration.autoloader here:

   https://github.com/rails/rails/blob/master/railties/lib/rails/application/configuration.rb

   and also set it to :zeitwerk in the 6.0 defaults.

2. Then, we define Rails.autoloaders here

fxn

require "benchmark/ips"

Benchmark.ips do |x|
  x.report("without TZ") do |n|
    ENV["TZ"] = nil

    i = 0
    while i < n
      Time.now
      i += 1

fxn

#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>

int main(void)
{
    struct timeval now;
    double seconds;

    gettimeofday(&now, NULL);

fxn

defmodule M do
  @x N.f()
end

fxn

find . -name '*.ex' -or -name '*.exs' | xargs perl -ni -le 'print unless /^\s*(\@doc|\@moduledoc) """/ ... /^\s*"""/'

fxn

Four solutions

I have worked first with the file downloaded to make sure I got the result right. Those drafts are not here.

After that we have four solutions:

1. A simple one that fetches the entire payload in one request.
2. An streamed one, same idea, but processing by chunks.
3. A parallel approach that speeds up the download using HTTP range requests.
4. A variant of the previous one that parallelizes the computation as well.

fxn

{_, mfa} = :erlang.process_info(self(), :current_function)
IO.inspect(mfa) #=> {:elixir_compiler_0, :__FILE__, 1}

fxn

class EventsLoader
  def initialize(...)
    ...
  end

  def load
    load_job_creation_events +
      load_drivers_on_duty_events +
      load_drivers_off_duty_events +
      load_drivers_rejected_events