Array Iterator : Composite « Design Patterns « Ruby

1. Ruby
2. Design Patterns
3. Composite

Array Iterator

class ArrayIterator
  def initialize(array)
    @array = array
    @index = 0
  end

  def has_next?
    @index < @array.length
  end

  def item
    @array[@index]
  end
  def next_item
    value = @array[@index]
    @index += 1
    value
  end
end

array = ['red', 'green', 'blue']

i = ArrayIterator.new(array)
while i.has_next?
  puts("item: #{i.next_item}")
end

# Running this code will give us the output we expect:

# item: red
# item: green
# item: blue

 

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