Named Parameters

Part of the Fundamentals section of Coddy's Dart journey. Lesson 73 of 94.

Named parameters in Dart allow you to specify function parameters by name rather than position. They're defined using curly braces {} in the function declaration.

Create a function with named parameters:

void greet({String name, int age}) {
  print('Hello, $name! You are $age years old.');
}

void main() {
  greet(name: 'Dart', age: 12);
}

After executing the above code, the output will be:

Hello, Dart! You are 12 years old.

When calling a function with named parameters, you specify the parameter name followed by a colon:

void main() {
  // Parameters can be in any order
  greet(age: 30, name: 'Alice');
}

After executing the above code, the output will be:

Hello, Alice! You are 30 years old.

Challenge

Beginner

In this challenge, you'll practice using named parameters in Dart. Named parameters make function calls more readable by specifying parameter names when calling a function.

Complete the greetUser function by adding named parameters for name and age. Then call the function with the provided values.

Expected output:

Hello, Alice! You are 25 years old.

Try it yourself

void main() {
  // These values are already defined for you
  String userName = 'Alice';
  int userAge = 25;
  
  // TODO: Call the greetUser function with named parameters
  // Pass userName as the name parameter and userAge as the age parameter
  
  
  // The function is defined below
}

// TODO: Modify this function to use named parameters instead of positional parameters
// Hint: Use curly braces {} around the parameters
void greetUser({required String name, required int age}) {
  print('Hello, $name! You are $age years old.');
}