• 优雅处理错误 Handle errors gracefully
• 加上一点枚举和拓展（Extension）Extend your app with enums and extensions
• 美化你的CLI程序 Polish you CLI app
• 处理JSON数据 Work with JSON data
• 测试你的程序和代码 Test your app & code
• 简单爬虫 Fetch data from the internet
• 增加调试和监控日志 Add logging for debugging and monitoring

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优雅处理错误 Handle errors gracefully

加上一点枚举和拓展（Extension）Extend your app with enums and extensions

美化你的CLI程序 Polish you CLI app

处理JSON数据 Work with JSON data

测试你的程序和代码 Test your app & code

简单爬虫 Fetch data from the internet

增加调试和监控日志 Add logging for debugging and monitoring

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