[dart] QQ operator / ?? / ?=

String capitalizeName1(String? name){

  if(name != null){

    return name.toUpperCase();

  }

  return "javan";

}

String capitalizeName2(String? name) => name != null ? name.toUpperCase() : "javan" ;

String capitalizeName3(String? name) => name?.toUpperCase() ?? "javan";

void main(){

  capitalizeName3('javan');

  capitalizeName3(null);

}

 

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