Named optional parameter vs Positional Optional Parameter in Dart

Name Positional Optional Parameters

	main(List<String> arguments) {
	Person person1 = new Person('John', age: 26, address: 'NY');
	Person person2 = new Person('Lily', isMale: false, address: 'CA');
	print('${person1.name} is ${person1.age} years old and he/she is living in ${person1.address}');
	print('${person2.name} is ${person2.age} years old and he/she is living in ${person2.address}');
	}
	class Person {
	// [] positional optional params
	// {} named optional params
	Person(this.name, {this.age = 100, this.address = 'nowhere', this.isMale = true, this.isYoung = true});
	final bool isYoung;
	final bool isMale;
	final String name;
	final int age;
	final String address;
	}
	void printName({String name = 'No name'}) {
	print(name);
	}
	void printData([String name = 'No name', int age = 100]) {
	print('$name $age' );
	}

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