Basic examples: Dart call() and Function.apply()

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Basic Examples: Dart call() and Function.apply()

Basic examples of using call() and Function.apply() in Dart

Find this at dartpad.dartlang.org/df1fec65cf0b91a1dfa2f94dc4e43680.

main.dart

class Adder implements Function { 
   call(int a, int b) => a + b;
}

class Incrementer implements Function {
  int _amt;
  Incrementer(this._amt);
  call(int a) => a + _amt; 
}

Function f = (int n, int m, {operation: "add"}) {
  if (operation == "add") {
    return n + m;
  } else {
    return n - m;
  }
};

main() {
  Adder myAdder = new Adder();
  Incrementer myIncrementer = new Incrementer(2);
  
  print(myAdder(10, 3));
  print(myIncrementer(40));

  int a = Function.apply(f, [10,3]);
  print(a);
  int b = Function.apply(f, [10,3], {new Symbol("operation"): "subtract"});
  print(b);
}

Good example

Too bad, there is no way of doing the "apply" thingy with a class