write an extension to the String class to provide it


class String
  def vowels
    self.scan(/[aeiou]/i)
  end
end
puts "This is a test".vowels.join('-')

1.	Add method to system type
2.	Processing a String One Word at a Time by adding a method to string class
3.	Replacing Multiple Patterns in a Single Pass
4.	Writing an Inherited Class
5.	Override the method from String Class
6.	Regular expression based comparison
7.	String translation
8.	convert string to binary number
9.	Removes first character from self and returns it, changing self
10.	Adds last character of provided string to front of self
11.	Pops last character off self and returns it, changing self
12.	Pushes first character of provided string onto end of self
13.	Rotate left
14.	Rotate right
15.	Shifts first word off of self and returns; changes self
16.	Adds provided string to front of self
17.	Pops and returns last word off self; changes self
18.	Pushes provided string onto end of self
19.	Get acronym

write an extension to the String class to provide it : String class Extension « String « Ruby