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Answers and rating deltas for

what does the exclamation mark in Objective C means in "if (!["

Author Votes Δ
Ed S. 1 +0.33
Jason F 1 +2.43
Kendall Helmstetter Gelner 1 +0.75
alejandrormz 0 0.00
pmr 0 -0.78
Oscar Gomez 0 -2.31
MNT-Naveed Tabassum 0 -2.45
Last visited: Sep 14, 2014, 5:07:29 AM