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struct Me { let name = "Takuhiro Muta" let aka = "417.72KI" let experienceYears = 5 let company = "iRidge inc." let twitter = "417_72ki" let qiita = "417_72ki" let gitHub = "417-72KI" let products = [ "BuildConfig.swift", "MockUserDefaults", ] } TFMGEFTDSJQUJPO

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%VDL5ZQJOH class Duck: def walk(self): print("Duck walking") def quack(self): print("Quack!!") class Dog: def walk(self): print("Dog walking") def bark(self): print("Bark!!") def walk_and_quack(animal): animal.walk() animal.quack()

%VDL5ZQJOH class Duck: def walk(self): print("Duck walking") def quack(self): print("Quack!!") class Dog: def walk(self): print("Dog walking") def bark(self): print("Bark!!") def walk_and_quack(animal): animal.walk() animal.quack()

%VDL5ZQJOH class Duck: def walk(self): print("Duck walking") def quack(self): print("Quack!!") class Dog: def walk(self): print("Dog walking") def bark(self): print("Bark!!") def walk_and_quack(animal): animal.walk() animal.quack()

%VDL5ZQJOH class Duck: def walk(self): print("Duck walking") def quack(self): print("Quack!!") class Dog: def walk(self): print("Dog walking") def bark(self): print("Bark!!") def walk_and_quack(animal): animal.walk() animal.quack()

%VDL5ZQJOH walk_and_quack(Duck()) # Duck walking # Quack!! walk_and_quack(Dog()) # Dog walking # AttributeError: 'Dog' object has # no attribute 'quack'

*O0CK$ @interface Duck: NSObject - (void)walk; - (void)quack; @end @implementation Duck - (void)walk { NSLog(@"Duck walking"); } - (void)quack { NSLog(@"Quack!!"); } @end void walkAndQuack(id animal) { [animal walk]; [animal quack]; }

*O0CK$ @interface Duck: NSObject - (void)walk; - (void)quack; @end @implementation Duck - (void)walk { NSLog(@"Duck walking"); } - (void)quack { NSLog(@"Quack!!"); } @end void walkAndQuack(id animal) { [animal walk]; [animal quack]; }

*O0CK$ @interface Duck: NSObject - (void)walk; - (void)quack; @end @implementation Duck - (void)walk { NSLog(@"Duck walking"); } - (void)quack { NSLog(@"Quack!!"); } @end void walkAndQuack(id animal) { [animal walk]; [animal quack]; }

*O0CK$ walkAndQuack([Duck new]); // Duck walking // Quack!! walkAndQuack([Dog new]); // Dog walking // unrecognized selector sent to instance

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