一个迭代器模式的小例子_js 迭代器模式小故事-优快云博客

博客给出了一个参考链接https://blog.youkuaiyun.com/zhengzhb/article/details/7610745 ，可能与设计模式相关，还提及了例子，但未详细说明内容。

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参考：https://blog.youkuaiyun.com/zhengzhb/article/details/7610745

例子：

# 抽象迭代器
class Iterator:
    def has_next(self) -> bool:
        raise NotImplementedError("Must subclass me!")
    
    def first(self) -> object:
        raise NotImplementedError("Must subclass me!")
    
    def next(self) -> object:
        raise NotImplementedError("Must subclass me!")

# 具体迭代器
class ConcreteIterator(Iterator):
    def __init__(self):
        self.container = []
        self.cursor = 0
    
    def has_next(self) -> bool:
        return True if self.cursor < len(self.container) else False
    
    def first(self) -> object:
        if len(self.container) >= 0:
            return self.container[0]
    
    def next(self) -> object:
        if self.has_next():
            current_element = self.container[self.cursor]
            self.cursor += 1
            return current_element
        return None
        
# 抽象容器
class Container:
    def iterator(self) -> Iterator:
        raise NotImplementedError("Must subclass me!")
        
    def add(self, element) -> None:
        raise NotImplementedError("Must subclass me!")
    
    def remove(self, element) -> None:
        raise NotImplementedError("Must subclass me!")
    
# 具体容器
class ConcreteContainer(Container):
    def __init__(self):
        self.it = self.iterator()
    
    def iterator(self) -> Iterator:
        return ConcreteIterator()
    
    def add(self, element) -> None:
        self.it.container.append(element)
    
    def remove(self, element) -> None:
        self.it.container.remove(element)
    
# 测试    
if __name__ == '__main__':
    mycontainer = ConcreteContainer()
    mycontainer.add("xixi")
    mycontainer.add("haha")
    mycontainer.add("hehe")
    mycontainer.add("hihi")
    mycontainer.add("wuwu")
    mycontainer.add("wawa")
    
    myiter = mycontainer.it  # 获取容器的迭代器
    while myiter.has_next():
        print(myiter.next())