目录orElse 代码orElseGet代码orElseThrow代码这3个都是用来处理null的情况：orElse 用的是括号内的对象orElseGet 用的是Supplier接口返回的对象。 supplier接口就一个get方法。无入参，出参要和Optional的js对象同类
I\'m using HTML_Template for templating in my C++-based web app (don\'t ask).I chose that because it was very simple and it turns out to be a good solution.
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