[Dart] #3.2 Recap ^_^ (positional,named,required,default)

 

//positional parameter  cf.positional은 required가 default이다.
String P_sayHello(String name, int age, String country) {
	return "Hello $name, you are $age, and you come from $country";
}

//named parametre
String N_sayHello({String name, int age, String country}) {
	return "Hello $name, you are $age, and you come from $country";
}

//required 
String R_sayHello({
	required String name, 
    required int age, 
    required String country
    }) {
	return "Hello $name, you are $age, and you come from $country";
}

//default values
String D_sayHello({
	String name = 'nico', 
    int age = 12, 
    String country = 'cuba',
    }) {
	return "Hello $name, you are $age, and you come from $country";
}

void main() {
	print(P_sayHello("nico",'cuba",12); //positional parameter(recommend max 2 params.))
    print(N_sayHello(
    	age : 12,
        country : 'cuba',
        name : 'nico',
        ));
    print(R_sayHello()) //required:won't be compiled 
    print(D_sayHello(	//default values:Okay without some values.
    	age : 99
        ));
    
}