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class String
  def escape_single_quotes
    self.gsub(/'/, "\\\\'")
  end
end

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array.inject{|sum,x| sum + x }

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# Courtesy http://www.allerin.com/blog/?p=186

class ActiveRecord::Base

  def self.skip_callback(callback, &block)

    method = instance_method(callback)

    remove_method(callback) if respond_to?(callback)

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# Taken from http://codesnippets.joyent.com/posts/show/1812

# takes a number and options hash and outputs a string in any currency format
def currencify(number, options={})
  # :currency_before => false puts the currency symbol after the number
  # default format: $12,345,678.90
  options = {:currency_symbol => "$", :delimiter => ",", :decimal_symbol => ".", :currency_before => true}.merge(options)
  
  # split integer and fractional parts 
  int, frac = ("%.2f" % number).split('.')

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You can use

git add -u

To add the deleted files to the staging area, then commit them

git commit -m "Deleted files manually"

Delete a branch on Github

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def format_time_difference(start_time, end_time)
    difference = end_time.to_i - start_time.to_i
    hours = difference/3600.to_i
    minutes = (difference/60 - hours * 60).to_i
    seconds = (difference - (minutes * 60 + hours * 3600))
    sprintf("%02d:%02d:%02d\n", hours, minutes, seconds)
  end

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#!/usr/bin/env ruby

# From my blog post at http://www.postal-code.com/binarycode/2009/06/06/better-range-intersection-in-ruby/

class Range
  def intersection(other)
    raise ArgumentError, 'value must be a Range' unless other.kind_of?(Range)

    my_min, my_max = first, exclude_end? ? max : last
    other_min, other_max = other.first, other.exclude_end? ? other.max : other.last

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Time.now.in_time_zone("Eastern Time (US & Canada)")

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for i in 1..5
    begin
        do_something_that_might_raise_exceptions(i)
    rescue
        next    # do_something_* again, with the next i
    end
end

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# created by Nathan Broadbent (http://madebynathan.com/2011/03/31/thanks-first-council-of-nicaea/)

def easter(year)
  c=year/100
  n=year-19*(year/19)
  k=(c-17)/25
  i=c-c/4-(c-k)/3+19*n+15
  i-=30*(i/30)
  i-=(i/28)*(1 -(i/28)*(29/(i+1))*((21-n)/11))
  j=year+year/4+i+2-c+c/4