leikind

<% grid(@countries_grid, :erb_mode => true) do |g| %>
  <% g.column :column_name => 'Name', :attribute_name => 'name' do |country| %>
    <b>Name: <%= link_to(country.name, country_path(country)) %></b>
  <% end %>
<% end -%>

leikind

def screen_density diagonal_size_inches, width_pixels, height_pixels
   Math.sqrt(width_pixels * width_pixels + height_pixels * height_pixels) / diagonal_size_inches
end

[
  ['Kindle Fire', 7, 600, 1024],
  ['Nexus 10', 10.05, 2560, 1600],
  ['Kindle Fire HD', 7, 1280, 800],
  ['Asus Transformer Pad Infinity 700 Series', 10.1, 1920, 1200],
  ['Asus Transformer Pad TF300', 10.1, 1280, 800],

leikind

word_signature = ->(word){
  word.split('').sort.join('')
}

word_minus_letters_on_indexes = ->(word, ind){
  list = word.split('')
  list[ind] = nil
  list.flatten.join
}

leikind

class Fibonacci
  include Enumerable

  def initialize
    @f1 = @f2 = 1
  end

  def each
    yield @f1
    loop do

leikind

require 'fiber'

module Enumerable
  def my_each
    if block_given? # usual execution with a block
      self.each do |e|
        yield e
      end
    else # no block given!

leikind

su

# Install rbenv
git clone git://github.com/sstephenson/rbenv.git /usr/local/rbenv

# Add rbenv to the path:
echo '# rbenv setup' > /etc/profile.d/rbenv.sh
echo 'export RBENV_ROOT=/usr/local/rbenv' >> /etc/profile.d/rbenv.sh
echo 'export PATH="$RBENV_ROOT/bin:$PATH"' >> /etc/profile.d/rbenv.sh
echo 'eval "$(rbenv init -)"' >> /etc/profile.d/rbenv.sh

leikind

[
     {
        "id": "tools",
        "children":
        [{
            "caption": "SublimeREPL",
            "mnemonic": "r",
            "id": "SublimeREPL",
            "children":
            [

leikind

[
    {
        "caption": "SublimeREPL: SML",
        "command": "run_existing_window_command", "args":
        {
            "id": "repl_sml",
            "file": "config/SML/Main.sublime-menu"
        }
    }
]

leikind

object PassByNameDemo extends App {

  def badImplementationOfAnd(arg1: Boolean, arg2: Boolean) = if (arg1) arg2 else false

  // Causes:    java.lang.ArithmeticException: / by zero
  // because the secons argument is always evaluated no matter if the first is true or false
  // badImplementationOfAnd( 1 == 2, 3 == (1 / 0))

  def goodImplementationOfAnd(arg1: Boolean, arg2: => Boolean) =  if (arg1) arg2 else false

leikind

object PassByNameDemo extends App {

  def badImplementationOfAnd(arg1: Boolean, arg2: Boolean) = if (arg1) arg2 else false

  // Causes:    java.lang.ArithmeticException: / by zero
  // because the second argument is always evaluated no matter if the first is true or false
  // badImplementationOfAnd( 1 == 2, 3 == (1 / 0))

  def goodImplementationOfAnd(arg1: Boolean, arg2: => Boolean) =  if (arg1) arg2 else false