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Answers and rating deltas for

Could someone in simple terms explain to me the visitor pattern's purpose with examples if possible

Author Votes Δ
Juliet 70 +0.35
Noel Ang 27 +1.52
Kaili 5 -0.96
Egor Pavlikhin 1 -3.35
Last visited: Sep 14, 2014, 5:07:29 AM