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# t1 and t2 are Time objects
# t is a class with attributes hours, minutes, and seconds

diff = t2 - t1
%w(hours minutes seconds).each do |duration|
  diff -= (t.send("#{duration}=", (diff / 1.send(duration)).round)).send(duration)
end

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epsilon = .000001
x1 and x2 are equal if (fabs(x1 - x2) < epsilon)

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Toast.makeText(getActivity().getApplicationContext(), "in onResume",
        Toast.LENGTH_LONG).show();

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// formatting numbers

// => "1.2"
String.format("%s", new DecimalFormat("#.##").format(1.2))

// => "1.20"
String.format("%.2f", 1.2)

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class Post < ActiveRecord::Base
  has_many :post_tags
  has_many :tags, through: :post_tags
end

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## One way to do it is from the rails console:
require 'db/migrate/MIGRATION_FILE_NAME.rb'

# if using def change
MigrationClass.new.migrate(:down)

# if using up or down
MigrationClass.up

## Another way is using a rake task

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Editing

Command(s)	Description
o and O	insert new line below and above respectively.
dd	delete current line
x	delete highlighted character
shift+x	delete character to left
dw	delete a word
de	delete to end of word
/	to search, then n or N to go forward and back in results

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Bash inside of ubuntu image

docker run -it -v /Users:/Users ubuntu bash

On boot

boot2docker up

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FROM ubuntu:latest

MAINTAINER Your Name <yourEmail@email.com>

RUN apt-get update
RUN apt-get -y upgrade

# Install apache, PHP, and supplimentary programs. curl and lynx-cur are for debugging the container.
RUN DEBIAN_FRONTEND=noninteractive apt-get -y install apache2 libapache2-mod-php5 php5-mysql php5-gd php-pear php-apc php5-curl curl lynx-cur

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// when the view is wired up using Storyboard and a custom xib, initWithCoder is called.
class MyViewController: UIViewController {

  @IBOutlet var myView: MyView!

  override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
  }