Merge pull request #83 from clovisphere/master

add Dart solution

Author: nickjj

dart/for-each.dart

@@ -0,0 +1,44 @@
+
+var sections = [
+	{
+		'title': 'Getting Started',
+		'resetLessonPosition': false,
+		'lessons': [
+			{'name': 'Welcome'}, 
+			{'name': 'Installation'}
+		]
+	},
+	{
+		'title': 'Basic Operator',
+		'resetLessonPosition': false,
+		'lessons': [
+			{'name': 'Addition / Substraction'}, 
+			{'name': 'Multiplication / Division'}
+		]
+	}, 
+	{
+		'title': 'Advanced Topics',
+		'resetLessonPosition': true,
+		'lessons': [
+			{'name': 'Mutability'}, 
+			{'name': 'Immutability'}
+		]
+	}
+];
+
+void main() {
+	var sectionCounter = 0;
+	var lessonCounter  = 0;
+
+	for (var section in sections) {
+		if (section['resetLessonPosition'] as bool) {
+			lessonCounter = 0;
+		}
+		section['position'] = ++sectionCounter;
+
+		for (var lesson in section['lessons'] as List) {
+			lesson['position'] = (++lessonCounter).toString();
+		}
+	}
+	print(sections);
+}