Building a Pokédex with KeyedCollection

pokedex.ipynb

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   "source": [
    "public class Pokemon {\n",
    "    \n",
    "    public Pokemon(string name, int hp, string type) {\n",
    "        Name=name;\n",
    "        Type=type;\n",
    "        HP=hp;\n",
    "    }\n",
    "\n",
    "    public readonly string Name;\n",
    "\n",
    "    public readonly int HP;\n",
    "\n",
    "    public readonly string Type;\n",
    "\n",
    "}"
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   "source": [
    "using System.Collections.ObjectModel;\n",
    "\n",
    "public class Pokedex : KeyedCollection<string,Pokemon> {\n",
    "\n",
    "    override protected string GetKeyForItem(Pokemon pokemon) {\n",
    "        return pokemon.Name;\n",
    "    }\n",
    "}"
   ]
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     "text": [
      "5\n"
     ]
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   "source": [
    "List<Pokemon> myPokemon = new() {\n",
    "    new Pokemon(\"Eevee\", 55, \"Normal\"),\n",
    "    new Pokemon(\"Pikachu\", 35, \"Electric\"),\n",
    "    new Pokemon(\"Vaporeon\", 130, \"Water\"),\n",
    "    new Pokemon(\"Lilligant\", 70, \"Grass\"),\n",
    "    new Pokemon(\"Floragato\", 61, \"Grass\")\n",
    "};\n",
    "\n",
    "Pokedex pokedex = new();\n",
    "myPokemon.ForEach(\n",
    "    pokemon => pokedex.Add(pokemon));\n",
    "\n",
    "Console.Out.WriteLine(pokedex.Count());\n"
   ]
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     "ename": "Error",
     "evalue": "System.ArgumentException: An item with the same key has already been added. Key: Eevee\n   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)\n   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)\n   at System.Collections.ObjectModel.KeyedCollection`2.InsertItem(Int32 index, TItem item)\n   at Submission#5.<<Initialize>>d__0.MoveNext()\n--- End of stack trace from previous location ---\n   at Microsoft.CodeAnalysis.Scripting.ScriptExecutionState.RunSubmissionsAsync[TResult](ImmutableArray`1 precedingExecutors, Func`2 currentExecutor, StrongBox`1 exceptionHolderOpt, Func`2 catchExceptionOpt, CancellationToken cancellationToken)",
     "output_type": "error",
     "traceback": [
      "System.ArgumentException: An item with the same key has already been added. Key: Eevee\n",
      "   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)\n",
      "   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)\n",
      "   at System.Collections.ObjectModel.KeyedCollection`2.InsertItem(Int32 index, TItem item)\n",
      "   at Submission#5.<<Initialize>>d__0.MoveNext()\n",
      "--- End of stack trace from previous location ---\n",
      "   at Microsoft.CodeAnalysis.Scripting.ScriptExecutionState.RunSubmissionsAsync[TResult](ImmutableArray`1 precedingExecutors, Func`2 currentExecutor, StrongBox`1 exceptionHolderOpt, Func`2 catchExceptionOpt, CancellationToken cancellationToken)"
     ]
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   ],
   "source": [
    "pokedex.Add(new Pokemon(\"Sandaconda\", 72, \"Ground\"));\n",
    "pokedex.Add(new Pokemon(\"Eevee\", 55 , \"Normal\"));"
   ]
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   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "True\n"
     ]
    }
   ],
   "source": [
    "bool havePikachu = pokedex.Contains(\"Pikachu\");\n",
    "Console.Out.WriteLine(havePikachu);"
   ]
  },
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   "cell_type": "code",
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     "text": [
      "False\n"
     ]
    }
   ],
   "source": [
    "pokedex.Remove(\"Pikachu\");\n",
    "bool havePikachu = pokedex.Contains(\"Pikachu\");\n",
    "Console.Out.WriteLine(havePikachu);"
   ]
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   "cell_type": "code",
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     "text": [
      "Eevee\n",
      "HP: 55\n",
      "Normal Type\n"
     ]
    }
   ],
   "source": [
    "public static void Print(this Pokemon pokemon) {\n",
    "    Console.Out.WriteLine($\"{pokemon.Name}\");\n",
    "    Console.Out.WriteLine($\"HP: {pokemon.HP}\");\n",
    "    Console.Out.WriteLine($\"{pokemon.Type} Type\");\n",
    "}\n",
    "\n",
    "Pokemon eevee = pokedex[\"Eevee\"];\n",
    "eevee.Print();"
   ]
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    {
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     "text": [
      "---\n",
      "Eevee\n",
      "HP: 55\n",
      "Normal Type\n",
      "---\n",
      "Vaporeon\n",
      "HP: 130\n",
      "Water Type\n",
      "---\n",
      "Lilligant\n",
      "HP: 70\n",
      "Grass Type\n",
      "---\n",
      "Floragato\n",
      "HP: 61\n",
      "Grass Type\n",
      "---\n",
      "Sandaconda\n",
      "HP: 72\n",
      "Ground Type\n"
     ]
    }
   ],
   "source": [
    "foreach(Pokemon pokemon in pokedex) {\n",
    "    Console.Out.WriteLine(\"---\");\n",
    "    pokemon.Print();\n",
    "}"
   ]
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    " pokedex.Where(pokemon=>pokemon.HP > 70).\n",
    "    Count()\n",
    "\n",
    "    "
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    "pokedex.Max(pokemon=>pokemon.HP)"
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   "source": [
    "public interface IPokemon {\n",
    "\n",
    "    string Name {get;}\n",
    "\n",
    "    int HP {get;}\n",
    "\n",
    "    string Type {get;}\n",
    "\n",
    "}\n",
    "\n",
    "public class WaterPokemon : IPokemon {\n",
    "\n",
    "    private readonly string _name;\n",
    "    private readonly int _hp;\n",
    "\n",
    "    public WaterPokemon(string name, int hp) {\n",
    "        _name=name;\n",
    "        _hp = hp;\n",
    "    }\n",
    "\n",
    "    public string Name => _name;\n",
    "\n",
    "    public int HP => _hp;\n",
    "\n",
    "    public string Type => \"Water\";\n",
    "\n",
    "}\n",
    "\n",
    "public class GrassPokemon : IPokemon {\n",
    "\n",
    "    private readonly string _name;\n",
    "    private readonly int _hp;\n",
    "\n",
    "    public GrassPokemon(string name, int hp) {\n",
    "        _name=name;\n",
    "        _hp = hp;\n",
    "    }\n",
    "\n",
    "    public string Name => _name;\n",
    "\n",
    "    public int HP => _hp;\n",
    "\n",
    "    public string Type => \"Grass\";\n",
    "\n",
    "}\n",
    "\n"
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   "source": [
    "public class Pokedex<TPokemon> : KeyedCollection<string,TPokemon>\n",
    " where TPokemon : IPokemon {\n",
    "\n",
    "    override protected string GetKeyForItem(TPokemon pokemon) {\n",
    "        return pokemon.Name;\n",
    "    }  \n",
    " }"
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   "source": [
    "    WaterPokemon vaporeon = new WaterPokemon(\"Vaporeon\", 130);\n",
    "    GrassPokemon lilligant = new GrassPokemon(\"Lilligant\", 70);\n",
    "    GrassPokemon florogato = new GrassPokemon(\"Floragato\", 61);\n",
    "\n",
    "    Pokedex<WaterPokemon> waterPokemon = new();\n",
    "    Pokedex<GrassPokemon> grassPokemon = new();\n",
    "    Pokedex<IPokemon> allPokemon = new();\n",
    "\n",
    "    waterPokemon.Add(vaporeon);\n",
    "\n",
    "    grassPokemon.Add(lilligant);\n",
    "    grassPokemon.Add(florogato);\n",
    "\n",
    "    allPokemon.Add(vaporeon);\n",
    "    allPokemon.Add(lilligant);\n",
    "    allPokemon.Add(florogato);"
   ]
  }
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