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class LRUCache
  attr_reader :dll, :hash, :count, :capacity
  def initialize(capacity)
    @dll = DLL.new
    @hash = Hash.new
    @count = 0
    @capacity = capacity
  end

  def read(key)

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http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)

#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?",  {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")

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copy/delete word under cursor in Vim
yw / byw

Assuming that the cursor is at the first character of the word simply do this in command mode:
     yw
y is for yank and w is for word.

Other ways of doing the same thing which are not as efficient:
     vey
the v starts visual select mode. e tells vim to move to end of word. y yanks or copies the word. to delete replace y with x.

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brew tap homebrew/cask-fonts
brew install --cask font-cascadia-code
brew install --cask font-cascadia-code-pl
brew install --cask font-cascadia-mono
brew install --cask font-cascadia-mono-pl

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# Update Neovim to latest from master
# https://github.com/neovim/neovim/commits/master
# You should have the Neovim repo cloned
upnvim() {
  cd ~/vim-dev/sources/neovim # change to your local repo
  git pull
  make distclean
  make CMAKE_BUILD_TYPE=RelWithDebInfo -j4 # Fast with Debug info. Not quite Release fast.
  sleep 10 # You don't need this but I have my reasons :-)
  sudo make install

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PostgreSQL Type	PostgreSQL Size	Description	Range	Diesel Type	Rust Type
Nullable Types		nullable		Nullable``

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Create PDF files from Markdown sources in OSX

When [Markdown][markdown] appeared more than 10 years ago, it aimed to make it easier to express ideas in an easy-to-write plain text format. It offers a simple syntax that takes the writer focus away from the formatting, thus giving her time to focus on the actual content.

The market abunds of editors to be used for help with markdown. After a few attempts, I settled to Sublime and its browser preview plugin, which work great for me and have a small memory footprint to accomplish that. To pass the results around to other people, less technical, a markdown file and a bunch of images is not the best approach, so converting it to a more robust format like PDF seems like a much better choice.

[Pandoc][pandoc] is the swiss-army knife of converting documents between various formats. While being able to deal with heavy-weight formats like docx and epub, we will need it for the more lightweight markdown. To be able to generate PDF files, we need LaTeX. On OSX, the s

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function GregToHijri(arg) {

	console.log ( 'arg' );
	console.log (arg);

	if(arg == ""){
		return "";
	}
	//declare a date format year,month,day sequence
	var arabic_date = new Array(0,0,0);