Impl pattern iterator (Github commits)

patterns/iterator/github_commit/github/commit.dart

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+class Commit {
+  String message;
+
+  Commit(this.message);
+}

patterns/iterator/github_commit/github/github_loader.dart

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+import 'dart:convert';
+import 'dart:io';
+import '../pattern/github_repo.dart';
+
+class GitHubLoader {
+  static Future<GitHubRepo> get({required userName, required repoName}) async {
+    final url = Uri.http(
+      'api.github.com',
+      'repos/$userName/$repoName/commits',
+      {'per_page': '10'},
+    );
+    final json = await _loadCommits(url);
+    return GitHubRepo(json);
+  }
+
+  static Future<List<dynamic>> _loadCommits(Uri url) async {
+    final client = HttpClient();
+    try {
+      final response = await client.getUrl(url);
+      final request = await response.close();
+      final content = await request.transform(utf8.decoder).join();
+      return jsonDecode(content);
+    } finally {
+      client.close();
+    }
+  }
+}

patterns/iterator/github_commit/main.dart

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+import 'github/commit.dart';
+import 'github/github_loader.dart';
+import 'pattern/github_repo.dart';
+
+void main() async {
+  final GitHubRepo gitHubRepo = await GitHubLoader.get(
+    userName: 'RefactoringGuru',
+    repoName: 'design-patterns-dart',
+  );
+
+  print(
+    'Iterate last 10 commits.'
+    '\n----------------------------',
+  );
+
+  for (Commit commit in gitHubRepo.commitIterator()) {
+    print(commit.message);
+  }
+}

patterns/iterator/github_commit/pattern/github_repo.dart

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+import '../github/commit.dart';
+
+class GitHubRepo {
+  GitHubRepo(this._json);
+
+  Iterable<Commit> commitIterator() sync* {
+    for (final jsonCommit in _json) {
+      var message = jsonCommit['commit']['message'] as String;
+      message = message.replaceAll(RegExp(r'\n+'), ' ');
+
+      yield Commit(message);
+    }
+  }
+
+  final List<dynamic> _json;
+}