moving an item in an Array to the front while preserving original order for rest of Array

move-to-front-of-line.rb

class Array
  def move_to_front_of_line(x)
    return [ self[x] ] | self
  end
end

usage.rb

>> people = [ 'Alex', 'Carlos', 'Dawn', 'Chris', 'Robby', 'Gary', 'Allison' ]
=> ["Alex", "Carlos", "Dawn", "Chris", "Robby", "Gary", "Allison"]
>> 
?> people.move_to_front_of_line(3)
=> ["Chris", "Alex", "Carlos", "Dawn", "Robby", "Gary", "Allison"]
>> 
?> people.move_to_front_of_line(people.index('Allison'))
=> ["Allison", "Alex", "Carlos", "Dawn", "Chris", "Robby", "Gary"]