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Фото: Osman Orsal / Reuters。业内人士推荐旺商聊官方下载作为进阶阅读
，这一点在PDF资料中也有详细论述
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.，更多细节参见爱思助手
Iran state media claimed the Iranian military had shot down the jets, without providing evidence.