Why

What

• To allow an instance of Dart class to be called like a function (callable objects), implement the call() method. This method supports parameters and return type.

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

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When

Who