finished ch19.2 and started ch19.3

.obsidian/workspace.json

@@ -77,6 +77,20 @@
               "title": "Refutability"
             }
           },
+          {
+            "id": "6d24bd7ca73ed503",
+            "type": "leaf",
+            "state": {
+              "type": "markdown",
+              "state": {
+                "file": "Pattern Syntax.md",
+                "mode": "source",
+                "source": false
+              },
+              "icon": "lucide-file",
+              "title": "Pattern Syntax"
+            }
+          },
           {
             "id": "6ed9f182aa3d5f3e",
             "type": "leaf",
@@ -88,7 +102,7 @@
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-        "currentTab": 3
+        "currentTab": 5
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     "direction": "vertical"
@@ -231,9 +245,10 @@
       "command-palette:Open command palette": false
     }
   },
-  "active": "78cd7043d5d51ffa",
+  "active": "6d24bd7ca73ed503",
   "lastOpenFiles": [
     "Pattern Matching.md",
+    "Pattern Syntax.md",
     "Refutability.md",
     "Places Patterns Can Be Used.md",
     "Implementing OO Design Pattern.md",
@@ -258,7 +273,6 @@
     "Ref Cell Mutability.md",
     "Reference Counter Smart Pointer.md",
     "The Performance Closures and Iterators.md",
-    "Improving The IO Project.md",
     "minigrep/src/lib.rs",
     "does_not_compile.svg",
     "Untitled.canvas",