implement example

examples/postly/lib/data/post_repository_impl.dart

@@ -0,0 +1,32 @@
+import 'package:dartz/dartz.dart';
+import '../domain/entity/post.dart';
+import '../domain/repository/post_repository.dart';
+import 'network/json_placeholder_api.dart';
+
+class PostRepositoryImpl implements PostRepository {
+  final JsonPlaceholderApi api;
+
+  PostRepositoryImpl(this.api);
+
+  @override
+  Future<Either<Exception, List<Post>>> getPosts() async {
+    try {
+      final posts = await api.getPosts();
+      return Right(posts
+          .map((e) => Post(id: e.id, title: e.title, body: e.body))
+          .toList());
+    } catch (e) {
+      return Left(Exception(e.toString()));
+    }
+  }
+
+  @override
+  Future<Either<Exception, Post>> getPost(int id) async {
+    try {
+      final post = await api.getPost(id);
+      return Right(Post(id: post.id, title: post.title, body: post.body));
+    } catch (e) {
+      return Left(Exception(e.toString()));
+    }
+  }
+}