pironim

Variance

The term variance describes how subtyping between higher kinded types is related to subtyping relations of their type arguments.

Higher Kinded Types

A higher kinded type composes type arguments to a new type. I use square bracket notation to define a higher kinded type:

C[T] // The higher kinded type `C` composes type argument `T` to a new type `C[T]`.

The same works with multiple type arguments:

pironim

# Usage:    IE={box} vagrant up
#
# Eg.       IE=XPIE6 vagrant up

boxes = {
    "XPIE6"     => "http://aka.ms/vagrant-xp-ie6",
    "XPIE8"     => "http://aka.ms/vagrant-xp-ie8",
    "VistaIE7"  => "http://aka.ms/vagrant-vista-ie7",
    "Win7IE8"   => "http://aka.ms/vagrant-win7-ie8",
    "Win7IE9"   => "http://aka.ms/vagrant-win7-ie9",

pironim

require 'oauth_util.rb'
require 'net/http'

o = OauthUtil.new

o.consumer_key = 'examplek9SGJUTUpocjZ5QjBJmQ9WVdrOVVFNHdSR2x1TkhFbWNHbzlNQS0tJnM9Y29uc3VtkZXJzZWNyZXQmeD0yYg--';
o.consumer_secret = 'exampled88d4109c63e778dsadcdd5c1875814977';

url = 'http://query.yahooapis.com/v1/yql?q=select%20*%20from%20social.updates.search%20where%20query%3D%22search%20terms%22&diagnostics=true';

pironim

$ vim --version
VIM - Vi IMproved 7.3 (2010 Aug 15, compiled May  4 2012 04:10:13)
Included patches: 1-429
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by buildd@
Huge version with GTK2 GUI.  Features included (+) or not (-):
+arabic +autocmd +balloon_eval +browse ++builtin_terms +byte_offset +cindent
+clientserver +clipboard +cmdline_compl +cmdline_hist +cmdline_info +comments
+conceal +cryptv +cscope +cursorbind +cursorshape +dialog_con_gui +diff
+digraphs +dnd -ebcdic +emacs_tags +eval +ex_extra +extra_search +farsi

pironim

In Rails 3

NOTE: This post now lives (and kept up to date) on my blog: http://hakunin.com/rails3-load-paths

If you add a dir directly under app/

Do nothing. All files in this dir are eager loaded in production and lazy loaded in development by default.

If you add a dir under app/something/

pironim

        RED="\[\033[0;31m\]"
     YELLOW="\[\033[0;33m\]"
 	  GREEN="\[\033[0;32m\]"
       BLUE="\[\033[0;34m\]"
  LIGHT_RED="\[\033[1;31m\]"
LIGHT_GREEN="\[\033[1;32m\]"
      WHITE="\[\033[1;37m\]"
 LIGHT_GRAY="\[\033[0;37m\]"
 COLOR_NONE="\[\e[0m\]"

pironim

cd ~
sudo apt-get update
sudo apt-get install openjdk-7-jre-headless -y

# Download the compiled elasticsearch rather than the source.
wget http://download.elasticsearch.org/elasticsearch/elasticsearch/elasticsearch-0.20.2.tar.gz -O elasticsearch.tar.gz
tar -xf elasticsearch.tar.gz
rm elasticsearch.tar.gz
sudo mv elasticsearch-* elasticsearch
sudo mv elasticsearch /usr/local/share

pironim

=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')