Original link: https://v3u.cn/a_id_256
Continuing from the last book, in the previous article, we have built a development environment for Ruby3 on all platforms. Now, we can get in touch with Ruby3 for the first time. Ruby is an interpreted programming language that is versatile at the object-oriented level. We can think of writing Ruby code as a behavioral art. Coding is like dancing. Every step in Ruby is elegant and almost no step is superfluous. Enter the first line of code into the irb terminal of the system and enter the first line of code: irb(main):001:0>puts “Hello Ruby!” Hello Ruby!=>nilputs The keyword is the basic word used for printing in the Ruby language Order. What is the nil output on the third line? In fact, it is the return value of the puts command. The puts command always returns nil, and nil is also Ruby…
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