filtering by author works

frontend/lib/pages/list.dart

@@ -30,7 +30,7 @@ class ListPage extends StatelessWidget {
       return Center(child: Text(provider.error!));
     }
 
-    final quoteCount = provider.quotes.length;
+    final quoteCount = provider.filteredQuotes.length;
 
     return
       Column(
@@ -229,9 +229,7 @@ class ListPage extends StatelessWidget {
           ),
           IconButton(
             icon: Icon(Icons.search),
-            onPressed: () {
-              provider.filterQuotes;
-            },
+            onPressed: provider.filterQuotes,
           ),
           IconButton(
             icon: Icon(Icons.more_horiz),

frontend/lib/provider/quote_provider.dart

@@ -13,10 +13,23 @@ class QuoteProvider extends ChangeNotifier {
   String? _error;
 
   List<Quote> get quotes => _quotes;
-  List<Quote> get filteredQuotes => _filteredQuotes;
   Set<String> get authors => _authors;
   bool get loading => _loading;
   String? get error => _error;
+  List<Quote> get filteredQuotes {
+    final query = filterController.text.toLowerCase();
+
+    return _quotes.where((quote) {
+      switch (filterBy) {
+        case 0:
+          return quote.author.toLowerCase().contains(query);
+        case 1:
+          return quote.body.toLowerCase().contains(query);
+        default:
+          return true;
+      }
+    }).toList();
+  }
 
   final QuoteRepository repo = QuoteRepository();
 
@@ -39,21 +52,6 @@ class QuoteProvider extends ChangeNotifier {
   }
 
   void filterQuotes() {
-    _filteredQuotes = [];
-    for (var quote in _quotes) {
-      switch (filterBy) {
-        case 0:
-          if (quote.author.toLowerCase() == filterController.text.toLowerCase()) {
-            _filteredQuotes.add(quote);
-          }
-          break;
-        case 1:
-          if (quote.body.toLowerCase().contains(filterController.text.toLowerCase())) {
-            _filteredQuotes.add(quote);
-          }
-          break;
-      }
-    }
     notifyListeners();
   }