fxn

FROM ubuntu:latest

# See https://github.com/oracle/truffleruby/blob/master/tool/docker-configs.yaml.
RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
  make \
  gcc \
  libssl-dev \
  libz-dev \
  ca-certificates \
  aria2

fxn

module ForkedSpecs
  def forked_specs(*specs)
    ActiveRecord::Base.clear_all_connections!

    pids = []
    specs.each do |spec|
      pids << fork do
        ActiveRecord::Base.establish_connection
        spec.call
      end

fxn

<div class="card"><div class="content">{{Back}}</div></div>

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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

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#!/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

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