Mega Code Archive
Internal Iterators versus External Iterators
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class Iterator
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
def merge(array1, array2)
merged = []
iterator1 = Iterator.new(array1)
iterator2 = Iterator.new(array2)
while( iterator1.has_next? and iterator2.has_next? )
if iterator1.item < iterator2.item
merged << iterator1.next_item
else
merged << iterator2.next_item
end
end
while( iterator1.has_next?)
merged << iterator1.next_item
end
while( iterator2.has_next?)
merged << iterator2.next_item
end
merged
end
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