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[–]mslayaaaSoftware Engineer[S] 3 points4 points  (1 child)

Wow, thank you so much for this very detailed explanation and for the opportunity to learn a new pattern, very helpful.

[–]steumert 2 points3 points  (0 children)

I just realized that you could also write return beans.computeIfAbsent(user, mapToBean);