Programming Ruby 3.2 (5th Edition): Add &: to Appendix 2. I Can’t Look It up! (page 637)
@noelrappin
I think this thing &: would be a great addition to the list of notation and typography that is called by a name that is not necessarily obvious, making it hard to search for the meaning of a particular line of code. Example code
["text", "more text"].map(&:upcase)
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