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    if-null operator
  
        
  
    
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  | // As funções whatLangA, whatLangB e whatLangC implementam a mesma funcionalidade. | |
| var language = "Dart"; | |
| whatLangA() => language ?? "not Dart"; | |
| whatLangB() => language == null ? "not Dart" : language; | |
| whatLangC() { | |
| if (language==null) return "not Dart"; | |
| else return language; | |
| } | 
  
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