Testing if an arbitrary pointer is a valid Objective-C object
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Beginning Objective-C Data Types: Bool - raywenderlich.com - YouTube
初心者必見！Objective-CでBOOLを使う5つのコツ | Japanシーモア
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Write Objective-C Code
Blocks and Closures in Objective-C | by Amy Joscelyn | Medium
Is Objective-C BOOL a boolean type? It depends : r/programming
Two Ring Software % Blog % Objective-C Block Syntax % 27 February 2017
boolean - Weird Objective-C BOOL behavior - Stack Overflow
Solved Objective-C Assessment What will this code produce in | Chegg.com
