So with Ruby permitting Procs called on Objects I’ve found sometimes a Colon Method will work, and sometimes you need a Ampersand Colon Method.  For example, when I map &:upcase on a list of strings it works. [“a”,”b”,”c”].map(&:upcase) # = > [“A”, “B”, “C”] But if I try without the Ampersand I get: [“a”,”b”,”c”].map(:upcase) #…

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