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View net http versus
$ time curl -L --fail --retry 5 --retry-delay 1 --connect-timeout 3 --max-time 30 -I
# => real 0m0.117s
$ cat <<EOF | ruby
  require 'net/http'
  require 'benchmark'
View output.txt
$ docker run -it --rm ruby:2.6 bash
root@22e145f8dfa6:/# gem install rails
Fetching concurrent-ruby-1.1.5.gem
Fetching thread_safe-0.3.6.gem
Fetching activesupport-5.2.3.gem
Fetching crass-1.0.4.gem
Fetching i18n-1.6.0.gem
Fetching tzinfo-1.2.5.gem
Fetching rack-2.0.7.gem
Fetching rack-test-1.1.0.gem
View 0_respond_to.rb
# frozen_string_literal: true
require "active_record"
ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Schema.define do
create_table :users, force: true do |t|
t.string :name, :email, :username, :password, :birthday, :foo, :bar, :baz, :dog_name
t.timestamps null: false
View vagrant.txt
default: Requirement already satisfied (use --upgrade to upgrade): numpy in /usr/lib/python2.7/dist-packages
default: Downloading/unpacking pandas
default: Running (path:/tmp/pip_build_root/pandas/ egg_info for package pandas
default: /tmp/easy_install-y78IR5/numpy-1.16.1/ UserWarning: Unrecognized setuptools command, proceeding with generating Cython sources and expanding templates
default: run_build = parse_setuppy_commands()
default: /usr/lib/python2.7/distutils/ UserWarning: Unknown distribution option: 'python_requires'
default: warnings.warn(msg)
default: Traceback (most recent call last):
default: File "<string>", line 17, in <module>
default: File "/tmp/pip_build_root/pandas/", line 743, in <module>
View String#split with block.rb
# Ruby 2.6 introduced String#split that allows it to take a block instead of just returning an array
require 'benchmark/ips'
STRANG = "hello/there/hi/how/are/you/today".freeze
Benchmark.ips do |x|"normal") { first_strang = STRANG.split("/".freeze).first }"new ") {
View capybara.rb
require 'capybara'
Capybara.register_driver :selenium_chrome_headless_no_scroll do |app|
browser_options =
browser_options.args << '--headless'
browser_options.args << '--disable-gpu' if Gem.win_platform?
browser_options.args << '--hide-scrollbars', browser: :chrome, options: browser_options)
View 0-failure
remote: ! Could not find bundler (>= 0.a) amongst [actionmailer-3.2.11, actionpack-3.2.11, activemodel-3.2.11, activerecord-3.2.11, activeresource-3.2.11, activesupport-3.2.11, arel-3.0.2, builder-3.0.4, coffee-rails-3.2.2, coffee-script-2.2.0, coffee-script-source-1.4.0, erubis-2.7.0, execjs-1.4.0, hike-1.2.1, i18n-0.6.1, journey-1.0.4, jquery-rails-2.2.0, json-1.7.6, mail-2.4.4, mime-types-1.19, multi_json-1.5.0, pg-0.14.1, polyglot-0.3.3, rack-1.4.4, rack-cache-1.2, rack-ssl-1.3.2, rack-test-0.6.2, rails-3.2.11, railties-3.2.11, rake-10.0.3, rdoc-3.12, sass-3.2.5, sass-rails-3.2.6, sprockets-2.2.2, thor-0.16.0, tilt-1.3.3, treetop-1.4.12, tzinfo-0.3.35, uglifier-1.3.0]
remote: !
View gist:9733af3c17549e1f39d7c82bb98882e3
$ rails new myapp -d=postgresql
$ cd myapp/
$ git add .
$ git commit -m first
$ heroku create
$ git push heroku master
remote: -----> Ruby app detected
remote: !
remote: ! You must use Bundler 2 or greater with this lockfile.
~ $ rails c
/app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:18: [BUG] Segmentation fault at 0x0000000000001994
ruby 2.6.0dev (2018-11-25 schneems/bundler 65963) [x86_64-linux]
-- Control frame information -----------------------------------------------
c:0030 p:---- s:0171 e:000170 CFUNC :load_from_binary
c:0029 p:0014 s:0166 e:000165 METHOD /app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:18 [FINISH]
c:0028 p:---- s:0160 e:000159 CFUNC :fetch
c:0027 p:0069 s:0153 e:000152 METHOD /app/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/compile_cache/iseq.rb:37 [FINISH]
c:0026 p:---- s:0147 e:000146 CFUNC :require
View minitest.rb
require 'minitest/mock'
class Foo
def foo
def bar
You can’t perform that action at this time.