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Answers and rating deltas for

What is the meaning/logic of if(len ....) in the following bit of code?

Author Votes Δ
chux - Reinstate Monica 3 +0.40
Akhilesh Pandey 2 +0.92
Shloim 2 +0.39
M.K 1 -3.64
Last visited: Jan 22, 2019, 10:51:21 AM