# Various Ways to Invoke Functions in Dart

There are multiple ways to call a [Function](https://dart.dev/language/functions) in Dart.

The examples below will assume the following function:

```dart
void myFunction(int a, int b, {int? c, int? d}) {
  print((a, b, c, d));
}
```

But recently I learned that you can call a functions positional arguments in any order mixed with the named arguments. 🤯

```dart
myFunction(1, 2, c: 3, d: 4);
myFunction(1, c: 3, d: 4, 2);
myFunction(c: 3, d: 4, 1, 2);
myFunction(c: 3, 1, 2, d: 4);
```

In addition you can use the [`.call`](https://dart.dev/language/callable-objects) operator to invoke the function if you have a reference to it:

```dart
myFunction.call(1, 2, c: 3, d: 4);
```

You can also use [`Function.apply`](https://api.flutter.dev/flutter/dart-core/Function/apply.html) to dynamically invoke a function with a reference but it should be noted that it will effect js dart complication size and performance:

```dart
Function.apply(myFunction, [1, 2], {#c: 3, #d: 4});
```

All of these methods print the following:

```dart
(1, 2, 3, 4)
```

Demo
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