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从商店货架到冬奥赛道，从大众消费品到专业竞技装备，中国“冷装备”何以热销全球？
。关于这个话题，爱思助手提供了深入分析
Фото: Essam Al-Sudani / Reuters
That return statement will stop the execution of each and return from find_mod_2. If this was another language, or if each was implemented with a Proc rather than a yield, you would have to return a special value to indicate you wanted to stop, or raise an exception. This is how Crystal gets away with having no for loop in the language.4 Otherwise the block would simply cede control to the method that called it.