// Discover the surprising flexibility of calling Dart functions, including mixed positional and named arguments, the `.call` operator, and dynamic invocation with `Function.apply`.
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| name | various-ways-to-invoke-functions-in-dart |
| description | Discover the surprising flexibility of calling Dart functions, including mixed positional and named arguments, the `.call` operator, and dynamic invocation with `Function.apply`. |
| metadata | {"url":"https://rodydavis.com/posts/dart/function-invoking","last_modified":"Tue, 03 Feb 2026 20:04:32 GMT"} |
There are multiple ways to call a Function in Dart.
The examples below will assume the following function:
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. 🤯
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 operator to invoke the function if you have a reference to it:
myFunction.call(1, 2, c: 3, d: 4);
You can also use Function.apply to dynamically invoke a function with a reference but it should be noted that it will effect js dart complication size and performance:
Function.apply(myFunction, [1, 2], {#c: 3, #d: 4});
All of these methods print the following:
(1, 2, 3, 4)