null-aware-infix-operators-in-dart.dart

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import 'dart:developer' as devtools show log;

extension Log on Object? {
  void log() => devtools.log(toString());
}

extension OptionalInfixAddition<T extends num> on T? {
  T? operator +(T? other) {
    final shadow = this;
    if (shadow != null) {
      return shadow + (other ?? 0) as T;
    } else {
      return null;
    }
  }
}

void testIt() {
  int? age;
  age++; // age = null
  age += 1; // age = null
  age = 2; // age = 2
  age++; // age = 3
  age.log();
}