Dart arbitrary caching middleware

main.dart

var CacheDatabase = Map();


//An arbitrary function which returns a String
String sexNumberAsString() {
  return "69";
}

//Another arbitrary function which takes in arguments and returns a different type.
int add(int a, int b) {
  return a + b;
}

//The cache middleware function.
//Takes in a function and an optional list of parameters.
dynamic cache(Function f, [List? params]) {
  //Generate a unique key based on the two inputs.
  String key = f.toString() + (params ?? "").toString();
  
  //Search the cache database for the key, returning the value if found.
  if(CacheDatabase.containsKey(key)){
    print("Cache hit!");
    return CacheDatabase[key];
  }
  
  //If we didn't find the key, run the function f and store it in the db.
  print("Cache miss");
  var result = Function.apply(f, params);
  CacheDatabase[key] = result;
  return result;
 
}

void main() {
 print(cache(add, [0, 0]));       //Miss
 print(cache(add, [20, 50]));     //Miss
 print(cache(add, [0, 0]));       //Hit
 print(cache(add, [20, 50]));     //Hit
 print(cache(add, [1, 2]));       //Miss
 print(cache(add, [1, 3]));       //Miss
 print(cache(add, [0, 0]));       //Hit
 print(cache(sexNumberAsString)); //Miss
 print(cache(sexNumberAsString)); ///Hit
}