henrik

ExUnit.start

defmodule Golf.ChristmasTree do
  use ExUnit.Case
  import ExUnit.CaptureIO

  # Put your code between the triple quotes.
  # This is the 155 character baseline courtesy of @stoft.
  @code """
IO.puts "        *

henrik

defmodule MyMacro do
  defmacro pick(list) do
    after_block  = Keyword.fetch(list, :after)
    do_option    = Keyword.fetch(list, :do)
    else_options = Keyword.get_values(list, :else)

    :random.seed(:os.timestamp)
    option = Enum.random([do_option|else_options])

    [option, after_block]

henrik

# A convenient script for Elixir golfing.
# Provide your code and some test cases. Then run this file, e.g. "elixir caddy.exs".
# Outputs your character length and test results.
# Text input, text output and return values are all handled.
#
# By Henrik Nyh (http://henrik.nyh.se) under the MIT license.

ExUnit.start

defmodule Caddy.Example do

henrik

defmodule Twelixir do
  defmacro __using__(_) do
    quote do
      import Kernel, except: [@: 1]
      import Twelixir
    end
  end

  defmacro @({name, _, [message]}) do
    var = Macro.var(name, __MODULE__)

henrik

# Shortest (91 chars):
for n<-1..?d,r=&(rem(n,&1)==0&&IO.write&2)do;f=r.(3,"Fizz");b=r.(5,"Buzz");f||b||r.(1,n)end

# If newlines are required (99 chars):
for n<-1..?d,r=&(rem(n,&1)==0&&IO.write&2),do: (f=r.(3,"Fizz");b=r.(5,"Buzz");f||b||r.(1,n);:io.nl)

# Other solutions:
for n<-1..?d,r=&(rem(n,&1)==0&&IO.puts&2),do: r.(15,"FizzBuzz")||r.(3,"Fizz")||r.(5,"Buzz")||r.(1,n)
for n<-1..?d,do: Enum.find [{15,"FizzBuzz"},{3,"Fizz"},{5,"Buzz"},{1,n}],fn({d,t})->rem(n,d)==0&&IO.puts(t)end

henrik

ExUnit.start()

defmodule CompileTimeAssertions do
  defmacro assert_compile_time_raise(expected_exception, expected_message, fun) do
    # At compile-time, the fun is in AST form and thus cannot raise.
    # At run-time, we will evaluate this AST, and it may raise.
    fun_quoted_at_runtime = Macro.escape(fun)

    quote do
      assert_raise unquote(expected_exception), unquote(expected_message), fn ->

henrik

tweener = new Tweener

# If the onChange callback changes the state of a React component, pretty things will happen.
tweener.tween
  from: 1
  to: 100
  ms: 1000
  steps: 25
  onChange: (value) -> console.log("value is now #{value}")
  

henrik

defmodule ExMachina.With do
  def create(model, attrs, {ExMachina.With, defaults}) do
    full_attrs = Keyword.merge(defaults, attrs)
    IO.puts "create #{model} with #{inspect full_attrs}"
  end
end

defmodule ExMachina do
  def with(defaults) do
    {ExMachina.With, defaults}

henrik

My notes from updating to El Capitan, as a Ruby/Rails developer working in VirtualBox/Vagrant.

VirtualBox and Vagrant

Our dev environment currently requires us to use older versions of VirtualBox (4.3) and Vagrant (1.7.1).

It seems the new "SIP" protection messes with that version of VirtualBox.

I tried upgrading VirtualBox (to 5.0.6) and Vagrant (to 1.7.4). Those seemed to run fine on El Capitan, but we rely on Chef v. 10 and Vagrant doesn't seem to get along with it (error: "invalid option: --force-formatter").

henrik

IO.puts "My progress:"

1..100 |> Enum.each fn (i) ->
  IO.write "\r[#{String.duplicate "=", i}] #{i} %"
  :timer.sleep 25
end

IO.puts "\nDone!"