La classe game stocke l'index du tube sélectionné

plutôt qu'une référence de l'objet

js/model/game.js

 class Game {
 	#tubes;
-	#selectedTube;
+	#selectedTubeIndex;
 	
 	constructor(nbTubes, tubeLevel)
 	{
 		this.#tubes = [];
-		this.#selectedTube = null;
+		this.#selectedTubeIndex = -1;
 
 		for (let i = 0; i < nbTubes; i++)
 		{
 		return this.#tubes[tubeIndex];
 	}
 	
+	selectedTubeIndex()
+	{
+		return this.#selectedTubeIndex;
+	}
+
 	selectedTube()
 	{
-		return this.#selectedTube;
+		if (this.#selectedTubeIndex == -1) return null;
+		
+		return this.#tubes[this.#selectedTubeIndex];
 	}
 	
 	selectTubeAt(index)
 	{
 		if (this.isInRange(index))
 		{
-			this.#selectedTube = this.#tubes[index];
+			this.#selectedTubeIndex = index;
 		}
 	}
 	
 		
 		if (tubeIndex != -1)
 		{
-			let removed = this.#tubes.splice(tubeIndex, 1)[0];
-			if (removed = this.#selectedTube) this.unselectTube();
+			this.#tubes.splice(tubeIndex, 1)[0];
+			if (tubeIndex == this.#selectedTubeIndex) this.unselectTube();
 		}
 	}
 	
 	
 	unselectTube()
 	{
-		this.#selectedTube = null;
+		this.#selectedTubeIndex = -1;
 	}
 	
 	tubesNumber()