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Answers and rating deltas for

What does it mean "Predicates should not modify their state due to a function call"?

Author Votes Δ
463035818_is_not_a_number 18 +1.95
SergeyA 11 +0.53
Swift - Friday Pie 1 -0.14
Caleth 0 -2.19
Last visited: Dec 22, 2019, 3:27:20 AM