finished ch17.6 and ch18 intro

.obsidian/workspace.json

@@ -105,6 +105,34 @@
               "title": "Futures, Tasks and Threads Together"
             }
           },
+          {
+            "id": "e8a505fdeccc0275",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "OOP Programming Features.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "OOP Programming Features"
+            }
+          },
+          {
+            "id": "b49e674e0ebaaeb7",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "Characteristics of OO Languages.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "Characteristics of OO Languages"
+            }
+          },
           {
             "id": "2a974ca5442d705f",
             "type": "leaf",
@@ -158,7 +186,7 @@
             }
           }
         ],
-        "currentTab": 6
+        "currentTab": 8
       }
     ],
     "direction": "vertical"
@@ -301,10 +329,12 @@
       "command-palette:Open command palette": false
     }
   },
-  "active": "c00c13dd25b12ad4",
+  "active": "b49e674e0ebaaeb7",
   "lastOpenFiles": [
-    "Traits for Async.md",
+    "OOP Programming Features.md",
+    "Characteristics of OO Languages.md",
     "Futures, Tasks and Threads Together.md",
+    "Traits for Async.md",
     "Futures in Sequence.md",
     "Any Number of Futures.md",
     "Futures and Async.md",
@@ -328,8 +358,6 @@
     "Project Organization.md",
     "Writing_Tests.md",
     "minigrep/src/lib.rs",
-    "Test_Organization.md",
-    "Traits.md",
     "does_not_compile.svg",
     "Untitled.canvas",
     "Good and Bad Code/Commenting Pratices",