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Answers and rating deltas for

'can not use mutating member on immutable value ' how to fix this error in my code below?

Author Votes Δ
DonMag 1 +2.88
dfd 1 +1.64
Ted Hopp 0 -1.56
ldindu 0 -0.45
Last visited: Jun 24, 2017, 4:58:10 PM