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Dart Function

Dart function is object that accepts both positional and named parameters.

Named Parameters​

You can mix positional and named parameters in dart.

int calc(String op, {required int a, required int b}) {
  return switch (op) {
      "sum" => a + b,
      "mut" => a * b,
      _ =>  throw Exception('Unknown op ' + op)
  };
}

void main() {
  print(calc("sum", a: 1, b: 2));
  print(calc("mut", a: 2, b: 3));
}

References​