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。heLLoword翻译官方下载对此有专业解读
After a couple of minutes, just stop and think. What’s missing? What would make it easier to do that change, like the previous one?
If we don’t do this with lists, if we don’t make += do the in place assignment, if we don’t leave it open for types to do their own thing, depending on the circumstances, then there’s no value in += in the first place, because it’s just syntactic sugar for +.