Merge pull request #73 from jvelez1/crystal

Crystal With Map

Author: nickjj

crystal/with_map.cr

@@ -0,0 +1,45 @@
+sections = [
+  {
+    "title": "Getting started",
+    "reset_lesson_position": false,
+    "lessons": [
+      {"name": "Welcome"},
+      {"name": "Installation"}
+    ]
+  },
+
+  {
+    "title": "Basic operator",
+    "reset_lesson_position": false,
+    "lessons": [
+      {"name": "Addition / Subtraction"},
+      {"name": "Multiplication / Division"}
+    ]
+  },
+
+  {
+    "title": "Advanced topics",
+    "reset_lesson_position": true,
+    "lessons": [
+      {"name": "Mutability"},
+      {"name": "Immutability"}
+    ]
+  }
+]
+
+def indexing_lessons(lessons : Array)
+  lessons.map_with_index(1) { |lesson, index| lesson.merge({ position: index}) }
+end
+
+selected_lessons = sections.map { |section| section[:lessons] }.flatten
+indexed_lessons = indexing_lessons(selected_lessons)
+
+formated_section = sections.map do |section|
+  formated_lessons = indexed_lessons.shift(section[:lessons].size)
+  if section[:reset_lesson_position]
+    formated_lessons = indexing_lessons(section[:lessons])
+  end
+  section.merge(lessons: formated_lessons)
+end
+
+p formated_section