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/*
 * HTML5 ✰ Boilerplate
 *
 * What follows is the result of much research on cross-browser styling.
 * Credit left inline and big thanks to Nicolas Gallagher, Jonathan Neal,
 * Kroc Camen, and the H5BP dev community and team.
 *
 * Detailed information about this CSS: h5bp.com/css
 *
 * ==|== normalize ==========================================================

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# Patch for ransack (https://github.com/ernie/ransack) to use scopes
# Helps migrating from Searchlogic or MetaSearch
# Place this file into config/initializer/ransack.rb of your Rails 3.2 project
#
# Usage:
#   class Debt < ActiveRecord::Base
#     scope :overdue, lambda { where(["status = 'open' AND due_date < ?", Date.today]) }
#   end
#
#   Ransack out of the box ignores scopes. Example:

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#########################################
# Very basic rack application showing how to use a router based on the uri
# and how to process requests based on the HTTP method used.
#
# Usage:
# $ rackup config.ru
#
# $ curl -X POST -d 'title=retire&body=I should retire in a nice island' localhost:9292/ideas
# $ curl -X POST -d 'title=ask Satish for a gift&body=Find a way to get Satish to send me a gift' localhost:9292/ideas
# $ curl localhost:9292/ideas

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// suggested shell cmd line to run this:
//
//   mongo --shell example2.js
// 
// Note: the { out : … } parameter is for mongodb 1.8+

db.things.insert( { _id : 1, tags : ['dog', 'cat'] } );
db.things.insert( { _id : 2, tags : ['cat'] } );
db.things.insert( { _id : 3, tags : ['mouse', 'cat', 'dog'] } );
db.things.insert( { _id : 4, tags : []  } );

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--     | ln (abs(sin(x))), if x > 5
-- y = | x^2 + a^2,        if x <= 5 and a <= 3
--     | x / a + 7.8*a,    if x <= 5 and a > 3

y x a = if x > 5
        then log (abs (sin (x)))
        else
          if x <= 5 && a <= 3
          then x^2 + a^2
          else x / a + 7.8 * a

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convertStringToAction :: String -> Action
convertStringToAction str = case str of
  "Look"    -> Look
  "New"     -> New
  otherwise -> Quit

-- guards (охранные выражения)
convertStringToAction' :: String -> Action
convertStringToAction' str | str == "Look" = Look
                           | str == "New"  = New

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:io.format "The number is ~.2f~n", [5.578]
# => "The number is 5.58"

System.get_env "RUBYOPT"
# => "-rauto_gem"

Path.extname "dave/test.exs"
# => ".exs"

System.cwd

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defmodule Recursive do
  def len([]), do: 0
  def len([_head | tail]), do: 1 + len(tail)
end

IO.puts Recursive.len([1, 2, 3])
# => 3

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defmodule Recursive do
  def map([], _func), do: []
  def map([head | tail], func), do: [func.(head) | map(tail, func)]
end

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defmodule MyEnum do
  def all?([head | tail], func \\ fn x -> x end) do
    func.(head) && all?(tail, func)
  end
  def all?([], _), do: true

  def each([], _), do: []
  def each([head | tail], func) do
    [func.(head), each(tail, func)]
  end