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a = []
a.push(1) # enqueue the number 1 in the queue
a.push(2) # enqueue the number 2 in the queue
a.push(3) # enqueue the number 3 in the queue
# dequeue the first element, 1 has been in the queue longest
puts a.shift # => displays 1
a.push(4) # enqueue the number 4 in the queue
# dequeue the next element. 1 has been tended to
# already, so tend to the element that has been in
# the queue the longest, in this case 2
puts a.shift # => displays 2
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