I learned about double/single dispatch when I was an undergrad taking a course on design patterns. Trying to wrap my head around the visitor pattern was kind of

I learned about double/single dispatch when I was an undergrad taking a course on design patterns. Trying to wrap my head around the visitor pattern was kind of a pain, but once I saw how it was done in a language that supported double dispatch, it made a lot more sense. Overall, it was one of the more interesting and useful courses I took.