ruby << string - SERP Analysis

https://ruby-doc.org/core/String.html

https://stackoverflow.com/questions/29990933/ruby-differences-between-and-to-concatenate-a-string

https://ruby-doc.org/core-3.0.1/String.html

https://www.digitalocean.com/community/tutorials/how-to-work-with-strings-in-ruby

https://www.reddit.com/r/ruby/comments/16yhhc9/whats_the_stringb_method_and_why_when_would_you/

https://medium.com/%40AdamLombard/easy-ruby-plus-equals-vs-shovel-6f030875e366

https://www.reddit.com/r/ruby/comments/d5e2f5/why_can_you_change_strings_in_ruby_in_ways_that/

https://www.digitalocean.com/community/tutorials/how-to-work-with-string-methods-in-ruby

http://ruby-for-beginners.rubymonstas.org/bonus/string_interpolation.html

https://tudip.com/blog-post/lets-know-about-string-and-array-methods-in-ruby-to-clean-and-format-your-data/