bjhaid

_mix()
{
  local cur prev opts
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  prev="${COMP_WORDS[COMP_CWORD-1]}"
  if [[ ! -f /tmp/__mix_completion__ ]]; then
    opts=$(for i in `mix help | grep -ve "current:" | grep -ve "iex" | awk '{ print $2" " }'`; do echo $i; done);
    echo $opts > /tmp/__mix_completion__;
  else

bjhaid

# split windows like vim
# vim's definition of a horizontal/vertical split is reversed from tmux's
bind s split-window -v -c "#{pane_current_path}"
bind v split-window -h -c '#{pane_current_path}'

bind ^s split-window -v -c "#{pane_current_path}"
bind ^v split-window -h -c "#{pane_current_path}"

# move around panes with hjkl, as one would in vim after pressing ctrl-w
bind h select-pane -L

bjhaid

works in erlang

1> Bbsl = fun(Bin,Shift) -> <<_:Shift,Rest/bits>> = Bin, <<Rest/bits,0:Shift>> end.
#Fun<erl_eval.12.50752066>

fails in elixir (1.3.4)

bjhaid

Internet Scale Services Checklist

A checklist for designing and developing internet scale services, inspired by James Hamilton's 2007 paper "On Desgining and Deploying Internet-Scale Services."

• http://mvdirona.com/jrh/talksandpapers/jamesrh_lisa.pdf

Basic tenets

• Does the design expect failures to happen regularly and handle them gracefully?
• Have we kept things as simple as possible?

bjhaid

KafkaEx.create_worker(:foo, uris: Application.get_env(:kafka_ex, :brokers), consumer_group: "bar")
Enum.each(1..1000, fn x -> KafkaEx.produce("foo", 0, "bar#{x}") end) 
KafkaEx.fetch("foo", 0, worker_name: :foo, max_bytes: 100)   
# output
"""
[%KafkaEx.Protocol.Fetch.Response{partitions: [%{error_code: 0,
     hw_mark_offset: 1002, last_offset: 2,
     message_set: [%KafkaEx.Protocol.Fetch.Message{attributes: 0,
       crc: 2491399380, key: "", offset: 0, value: "bar"},
      %KafkaEx.Protocol.Fetch.Message{attributes: 0, crc: 702483308, key: "",

bjhaid

CSV.open('/tmp/sub.csv').each_with_object(Hash.new(0)) { |x,hash| hash[x[1]] += 1 }

bjhaid

    get '/twitter/:name' do
      content_type :json
      sorted_influencers(params[:name])
    end

    def sorted_influencers(name)
        # get first 2 tweets
      tweets = client.user_timeline(name)[0,1]
      # for each tweet, get the retweeters
      arr = tweets.map do |tweet|

bjhaid

class RomanNumerals
  NUM_TO_ROMAN = { 1000 => 'M', 900 => 'CM', 500 => 'D', 400 => 'CD', 100 => 'C', 90 => 'XC', 50 => 'L', 40 => 'XL', 10 => 'X' , 9 => 'IX', 5 => 'V', 4 => 'IV', 1 => 'I' }

  class << self

    def to_roman(num)
      NUM_TO_ROMAN.each_with_object("") { |(k,v), mem|  mem << (v * (num / k)); num = num % k  }
    end

    def from_roman(roman)

bjhaid

In this article, I'll walk through a basic Rails (3.2.x) setup for creating a nested resource for two models. Nested resources work well when you want to build out URL structure between two related models, and still maintain a RESTful convention. This code assumes you are running RVM to manage Ruby/Gem versions, and Git for version control.

Creating a new Rails project

$ mkdir family # create rvm gemset 
$ echo "rvm use --create ruby-1.9.2@family" > family/.rvmrc 
$ cd family # install rails 
$ gem install rails # create new rails project 
$ rails new . # version control 

bjhaid

def fib(n)
  (0..n).inject([1,0]) { |(a,b), _| [b, a+b] }[0]
end