theHamdiz

require 'set'
require 'forwardable'

set = SortedSet.new([8,6,4,2,0,5,9,66,8])

p set # => #<SortedSet: {0, 2, 4, 5, 6, 8, 9, 66}>
# How to implement the same 'SortedSet' functionality on your own
class SortedList
  include Enumerable
  extend Forwardable

theHamdiz

def bubble_sort(array)
  n =  array.length
  loop do
    swapped = false
    (n-1).times do |i|
      # if the item that comes first in the array is bigger than that comes next
      # then resort it
      if array[i] > array[i+1]
        array[i], array[i+1] = array[i+1], array[i]
        swapped = true

theHamdiz

first_names = ["Ahmad", "Ahmad", "Emad"]
last_names = ["Hamdi", "Magdi", "Elsaid"]

first_names.zip(last_names).inspect

theHamdiz

puts 'Renaming files...'

# a parameter to the program from command line. 

folder_path = ARGV[0] # /Users/a7madx7/Pictures/WallPapers

Dir.glob(folder_path + "/*").sort.each_with_index do |f, i|
    # prepare a the brand new 'renamed' complete file path.
    new_name = File.dirname(f) + '/' + i.to_s + File.extname(f)
    # do the actual renaming of the file.

theHamdiz

Ahmads-Mac-Pro:~ a7madx7$ rvm remove all
Are you SURE you wish to 'remove' all rubies?
(anything other than 'yes' will cancel) > yes
ruby-2.2.0 - #removing src/ruby-2.2.0..
ruby-2.2.0 - #removing rubies/ruby-2.2.0..
Ahmads-Mac-Pro:~ a7madx7$ rvm pkg install libyaml

Beware, 'rvm pkg ...' is deprecated, read about the new autolibs feature: 'rvm help autolibs'.

Checking requirements for osx.

theHamdiz

Ahmads-Mac-Pro:~ a7madx7$ cat /Users/a7madx7/.rvm/log/1421056561_ruby-2.2.0/install.log
[2015-01-12 11:58:33] __rvm_make
__rvm_make () 
{ 
    \make "$@" || return $?
}
current path: /Users/a7madx7/.rvm/src/ruby-2.2.0
PATH=/usr/local/opt/pkg-config/bin:/usr/local/Cellar/libtool/2.4.2/bin:/usr/local/opt/automake/bin:/usr/local/opt/autoconf/bin:/Users/a7madx7/.rbenv/shims:/Users/a7madx7/.rbenv/shims:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/a7madx7/.rvm/bin
command(2): __rvm_make install
++ make install

theHamdiz

rvm install 2.2.0
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.10/x86_64/ruby-2.2.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Certificates in '/usr/local/etc/openssl/cert.pem' are already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/a7madx7/.rvm/rubies/ruby-2.2.0, this may take a while depending on your cpu(s)...
ruby-2.2.0 - #downloading ruby-2.2.0, this may take a while depending on your connection...
ruby-2.2.0 - #extracting ruby-2.2.0 to /Users/a7madx7/.rvm/src/ruby-2.2.0....