knewter

Yup, so just run mix run image.exs on this sucker. You'll have to open the image manually if you're on a mac, and hey, storing it in my home dir might not work either :)

MSch

Benchfella.start duration: 1.0#, format: :machine

defmodule StringDuplicateBench do
  use Benchfella

  @iterations [100, 1000, 10000, 100000]
  Enum.each(@iterations, fn n ->
    @str "1234567890"
    @n n

fishcakez

@proto_version "1.0"

  def process_options(opts) do
    env_args()
    |> (&process_in(opts, &1)).()
    |> (&process_err(opts, &1)).()
    |> (&process_dir(opts, &1)).()
  end

  defp process_in(opts, args) do

chewbranca

On the Viability of Erlang Releases and CouchDB

There has been some discussion on what versions of Erlang CouchDB should support, and what versions of Erlang are detrimental to use. Sadly there were some pretty substantial problems in the R15 line and even parts of R16 that are landmines for CouchDB. This post will describe the current state of things and make some potential recommendations on approach.

Scheduler Collapse

alco

  def open_port(executable, args) do
    Port.open({:spawn_executable, executable}, [:stream, :binary, {:args, args}, :use_stdio, :stderr_to_stdout, :exit_status])
  end

  def process_port(port) do
    case collect_output(InternalData[port: port], []) do
      {status, data} -> Result[status: status, output: to_string(data)]
    end
  end

alco

iex> use PipeInspect
nil

iex> "hello" |> String.reverse |> String.upcase |> String.downcase
"olleh"
"OLLEH"
"olleh"

jameshfisher

Having read a few proofs that the halting problem is undecidable, I found that they were quite inaccessible, or that they glossed over important details. To counter this, I've attempted to re-hash the proof using a familiar language, JavaScript, with numerous examples along the way.

This famous proof tells us that there is no general method to determine whether a program will finish running. To illustrate this, we can consider programs as JavaScript function calls, and ask whether it is possible to write a JavaScript function which will tell us

alco

Problems with shell script:
* no builtin string processing
* obscure escaping rules
* no numbers
* no types 
* insane functions
* bad argument parsing
* i18n?
* no config parsing
* no dry run of the whole script

alco

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

typedef int i;       //Save space by using 'i' instead of 'int'
typedef float f;     //Save even more space by using 'f' instead of 'float'

//Define a vector class with constructor and operator: 'v'
struct v {
  f x,y,z;  // Vector has three float attributes.

alco

iex> """ |> Erlang.module_to_core |> IO.puts
...> -file("nofile", 1).
...> -module('Elixir.M').
...>  
...> -export([hello/0]).
...>  
...> hello() -> hello.
...> """
module 'Elixir.M' ['hello'/0,
                   'module_info'/0,