whenInt<T> function

T? whenInt<T>(
  1. int value,
  2. Map<int, ValueGetter<T>> conditionMap
)

English: Used to replace the switch method, because in some scenarios, an error warning of Case expressions must be constant;
If there is value in Map.keys of conditionMap, execute its corresponding ValueGetter method

中文: 用于取代switch方法，因为有些场景使用switch会出现Case expressions must be constant.的错误警告；
如果conditionMap的Map.keys中有value的话，执行其对应的ValueGetter方法

example:

String? status = whenInt<String>(1, {
  1: () {
    return "good";
  },
  1 + 1: () {
    return "nice";
  },
  int.parse("3"): () {
    return "better";
  },
});

Implementation

T? whenInt<T>(int value, Map<int, ValueGetter<T>> conditionMap) {
  return conditionMap[value]?.call();
}