pragtobgists

list = Enum.to_list(1..10_000)
map_fun = fn(i) -> [i, i * i] end

Bunny.eat(%{
  "flat_map"    => fn -> Enum.flat_map(list, map_fun) end,
  "map.flatten" => fn -> list |> Enum.map(map_fun) |> List.flatten end
})

pragtobgists

class User < ApplicationRecord
  attr_accessor :rollback

  after_save :potentially_rollback

  def potentially_rollback
    raise ActiveRecord::Rollback if rollback
  end
end

pragtobgists

User.transaction do
  User.create(name: 'Kotori')
  User.transaction(requires_new: true) do
    User.create(name: 'Nemu')
    raise ActiveRecord::Rollback
  end
end

pragtobgists

User.transaction do
  User.create(name: 'Kotori')
  User.transaction do
    User.create(name: 'Nemu')
    raise ActiveRecord::Rollback
  end
end

pragtobgists

def paint_control(event)
  # some painting code
rescue => e
  # Really important to rescue here. Failures that escape this method
  # cause odd-ball hangs with no stacktraces. See #559 for an example.
  puts "SWALLOWED PAINT EXCEPTION ON #{@obj} - go take care of it: " + e.to_s
  puts 'Unfortunately we have to swallow it because it causes odd failures :('
end

pragtobgists

# context, outlet, times, time per step, state, data
def pattern(c, o, t, l, s, d)
  # ...
end

pragtobgists

# do one thing
...
...
...
...

# do another thing
...
...
...

pragtobgists

# ATTENTION: gotta start phantomjs via `phantomjs --wd` first..
Application.ensure_all_started(:hound)
{:ok, server} = SimpleServer.start

Application.put_env(:hound, :app_host, "http://localhost")
Application.put_env(:hound, :app_port, SimpleServer.port(server))


use Hound.Helpers

pragtobgists

defmodule Benchee.Benchmark.Scenario do
  @moduledoc """
  A Scenario in Benchee is a particular case of a whole benchmarking suite. That
  is the combination of a particular function to benchmark (`job_name` and
  `function`) in combination with a specific input (`input_name` and `input`).
  It then gathers all data measured for this particular combination during
  `Benchee.Benchmark.measure/3` (`run_times` and `memory_usages`),
  which are then used later in the process by `Benchee.Statistics` to compute
  the relevant statistics (`run_time_statistics` and `memory_usage_statistics`).
  """

pragtobgists

list = Enum.to_list(1..10_000)
map_fun = fn(i) -> i + 1 end

Benchee.run %{
  "map tail-recursive with ++" =>
    fn -> MyMap.map_tco_concat(list, map_fun) end,
  "map with TCO reverse" =>
    fn -> MyMap.map_tco(list, map_fun) end,
  "stdlib map" =>
    fn -> Enum.map(list, map_fun) end,