To allow an instance of your Dart class to be called like a function, implement thecall() method.

Thecall() method allows an instance of any class that defines it to emulate a function. This method supports the same functionality as normalfunctions such as parameters and return types.

In the following example, theWannabeFunction class defines acall() function that takes three strings and concatenates them, separating each with a space, and appending an exclamation. ClickRun to execute the code.

class WannabeFunction {  String call(String a, String b, String c) => '$a $b $c!';}var wf = WannabeFunction();var out = wf('Hi', 'there,', 'gang');void main() => print(out);