03. Ruby入门理解

Ruby入门学习:

视频教程

https://www.bilibili.com/video/BV1QW411F7rh?t=401&p=1

笔记

https://github.com/haimait/RubyStudy

https://gitee.com/komavideo/LearnRuby

Ruby的.nil? .empty? .blank? .present?差别

https://blog.csdn.net/u013435984/article/details/53608920