55 lines
789 B
Ruby
55 lines
789 B
Ruby
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# Class Element
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class Element
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attr_accessor :datum, :next
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def initialize(datum)
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@datum = datum
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@next = nil
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end
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end
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# Class SimpleLinkedList
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class SimpleLinkedList
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def initialize(stack = [])
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@tail = nil
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stack.each do |data|
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element = Element.new(data)
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push(element)
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end
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end
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def push(element)
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element.next = @tail
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@tail = element
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self
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end
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def pop
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popped = @tail
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return popped if @tail.nil?
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@tail = popped.next
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popped
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end
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def to_a
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arr = []
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while @tail
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element = pop
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arr.push(element.datum)
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end
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arr
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end
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def reverse!
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new_tail = nil
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while @tail
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element = pop
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element.next = new_tail
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new_tail = element
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end
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@tail = new_tail
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self
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end
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end
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