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Mockable UserDefaults with Duck typing
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417.72KI
June 18, 2019
Programming
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1.1k
Mockable UserDefaults with Duck typing
417.72KI
June 18, 2019
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Transcript
.PDLBCMF6TFS%FGBVMUT XJUI %VDLUZQJOH QPUBUPUJQT
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
%VDL5ZQJOH
%VDL5ZQJOH w 0OFPGUIFNFUIPETUPJNQMFNFOU QPMZNPSQIJTN w 6TFEJOEZOBNJDMBOHVBHFT FH3VCZ 1ZUIPO w
0CKFDUTTVJUBCJMJUZJTEFUFSNJOFECZUIF QSFTFODFPGDFSUBJONFUIPETBOE QSPQFSUJFT w /PUPCKFDU`TPXOUZQF
r%BWF5IPNBT l*GJUXBMLTMJLFBEVDLBOERVBDLTMJLFB EVDL JUNVTUCFBEVDLz
%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
)PXUPNPDL 6TFS%FGBVMUT
r%BWF5IPNBT l*GJUXBMLTMJLFBEVDLBOERVBDLTMJLFB EVDL JUNVTUCFBEVDLz
l*GJUTBWFTPCKFDUTMJLF6TFS%FGBVMT BOEMPBETPCKFDUTMJLF6TFS%FGBVMUT JUNVTUCF6TFS%FGBVMUTz
%FpOFBMMNFUIPETJO /46TFS%FGBVMUT
%FpOFBMMNFUIPETJO /46TFS%FGBVMUT /PUFYUFOE/46TFS%FGBVMUT
*NQMFNFOU
%FpOFFYUFOTJPOUPVTFJU BT/46TFS%FGBVMUT
%FpOFFYUFOTJPOUPVTFJU BT/46TFS%FGBVMUT
%FpOFFYUFOTJPOUPVTFJU BT/46TFS%FGBVMUT ⁉
None
5IBOLZPV IUUQTHJUIVCDPN,*.PDL6TFS%FGBVMUT