Have got progression

assets/scripts/models/gamecontroller.js

@@ -25,6 +25,16 @@ export class GameController {
     return this._guesses;
   }
   
+  nextWord() {
+    if (!this._wordSource.nextWord()) {
+      return false;
+    }
+    
+    this._currentWord = this._wordSource.getCurrentWord();
+    this._guesses = 5;
+    return true;
+  }
+  
   checkGuess(guess) {
     if (guess.length != this._currentWord.length) {
       throw Error(`Expected length to be ${this._currentWord.length} but was ${guess.length}`);

assets/scripts/models/words.js

@@ -18,6 +18,11 @@ export class WordSource {
     }
     
     nextWord() {
-        this._currentWord += 1;        
+        if (this._currentWord >= this._words.length - 1) {
+            return false;
+        }
+        
+        this._currentWord += 1;
+        return true; 
     }
 }