Dart Function Tutorial

dart_functions.dart

void main() {
  /// Funtions Example:
  requiredFunction(1, 2);

  requiredOptionalPositionalFunction(1, 2);
  requiredOptionalPositionalFunction(1);

  requiredOptionalPositionalDefaultFunction(1);
  requiredOptionalPositionalDefaultFunction(1, 2);

  requiredOptionalNamed(1, b: 2);
  requiredOptionalNamed(1);

  requiredOptionalNamedDefault(1, b: 2);
  requiredOptionalNamedDefault(1);

  optionalPositionlFunction(2);
  optionalPositionlFunction();

  optionalPositionlDefaultFunction(2);
  optionalPositionlDefaultFunction();

  optionalNamed(b: 2);
  optionalNamed();

  optionalNamedDefault(b: 2);
  optionalNamedDefault();
}

void requiredFunction(int a, int b) {
  print("requiredFunction");
  print("a = $a");
  print("b = $b");
}

void requiredOptionalPositionalFunction(int a, [int? b]) {
  print("requiredOptionalPositionalFunction");

  print("a = $a");
  print("b = $b");
}

void requiredOptionalPositionalDefaultFunction(int a, [int b = 0]) {
  print("requiredOptionalPositionalDefaultFunction");

  print("a = $a");
  print("b = $b");
}

void requiredOptionalNamed(int a, {int? b}) {
  print("requiredOptionalNamed");

  print("a = $a");
  print("b = $b");
}

void requiredOptionalNamedDefault(int a, {int b = 0}) {
  print("requiredOptionalNamedDefault");

  print("a = $a");
  print("b = $b");
}

void optionalPositionlFunction([int? b]) {
  print("optionalPositionlFunction");

  print("b = $b");
}

void optionalPositionlDefaultFunction([int b = 0]) {
  print("optionalPositionlDefaultFunction");

  print("b = $b");
}

void optionalNamed({int? b}) {
  print("optionalNamed");

  print("b = $b");
}

void optionalNamedDefault({int b = 0}) {
  print("optionalNamedDefault");

  print("b = $b");
}