using System.Collections.Generic;

namespace Extensions;

public static class Extensions
{
  public static V GetOrCreate<K, V>(this Dictionary<K, V> dict, K key) 
    where V : new()
    where K: notnull  
  {
    if (!dict.TryGetValue(key, out V? value))
    {
      value = new V();
      dict[key] = value;        
    }
    return value;            
  }
}