ContainsKey constructor

Implementation

ContainsKey()
  : super(
      methodName: "containsKey",
      targetType: .map,
      arity: 1,
      function: (target, interpreter, arguments) {
        if (arguments[0] is! String) {
          throw RuntimeError("containsKey() requires a String argument");
        }
        return target.containsKey(arguments[0]);
      },
    );