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class Array
  def move(element, distance)
    current_pos = index(element)
    return self if current_pos.nil?
    new_pos = (current_pos+distance) - ((current_pos+distance)/length)*length
    delete(element)
    insert(new_pos, element)
  end
end

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IO.readlines("/usr/share/dict/words").map{|w| w.chomp}.select{|w| w.downcase.chars.sort.join == word.chars.sort.join}.reject{|w| w == word}

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# invoices_controller.rb 
  
  helper_method :available_filters

  def index
     @invoices = Invoice.send(filter_scope)
  end

  private 
    def available_filters

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[~/Projects/exercism]$ ruby ruby/rna-transcription/rna-transcription_test.rb
Run options: --seed 51147

# Running tests:

EEEEE

Finished tests in 0.001201s, 4163.1973 tests/s, 0.0000 assertions/s.

  1) Error:

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class Payment
  def process(gateway)
    gateway.verify(self) # duck typed.
  end
end

class PaymentTest
  def test_process
    payment = Payment.new
    payment.process(MockGatway.new)

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-- Determine size of databases
-- Source: http://stackoverflow.com/questions/1733507/how-to-get-size-of-mysql-database
SELECT table_schema "DB Name", Round(Sum(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB"
  FROM information_schema.tables
GROUP  BY table_schema;

-- Size in MB of the innodb_buffer_pool_size. Default is 128 MB.
-- More here: http://dev.mysql.com/doc/refman/5.5/en/innodb-parameters.html#sysvar_innodb_buffer_pool_size
SELECT @@innodb_buffer_pool_size / 1024 / 1024

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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# This allows stylesheets, scripts and images from the same origin host, but nothing else.
Content-Security-Policy: default-src 'none'; script-src 'self'; style-src 'self'; img-src 'self'

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# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

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# Linux Primer
## Where am I?
It can be intimidating when you are first confronted with prompt because you do not no where you are and what to do. This first section aims to help you orient yourself on any Linux system.

### The `pwd` command
`pwd`