TypeError: Cannot read property 'map' of undefined

回答: 这个错误通常是因为你在尝试对一个未定义的属性进行map操作。根据你提供的引用内容，可能是在React的todolist项目中出现的问题。解决这个问题的方法是确保你在使用map之前，先对该属性进行判断是否存在。你可以使用条件语句或者默认值来处理这种情况，以避免出现TypeError: Cannot read property 'map' of undefined的错误。
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