Stack and Queue in Ruby using array

queue.rb

# queue.rb
#
# Using array as queue
#
# Combine use of push and shift
#
# =OUTPUT=
#
# $ ruby1.9.1 queue.rb
# ["one", "two", "three"]
# one
# two
# three
# [] 
#

queue = []

queue.push "one"
queue.push "two"
queue.push "three"

p queue

puts queue.shift
puts queue.shift
puts queue.shift

p queue

stack.rb

# stack.rb
#
# Using array as stack
#
# Combine use of push and pop
#
# =OUTPUT=
#
# $ruby1.9.1 stack.rb
# ["one", "two", "three"]
# three
# two
# one
# []  
#

stack = []

stack.push "one"
stack.push "two"
stack.push "three"

p stack

puts stack.pop
puts stack.pop
puts stack.pop

p stack