diff --git a/slides.md b/slides.md
index 4e3d814..655381b 100644
--- a/slides.md
+++ b/slides.md
@@ -2,15 +2,15 @@
 marp: true
 title: Una mirada funciona a Java 21
 theme: gaia
-color: #fff
 footer: #Commitconf 2024
-backgroundImage: url('https://cdn.wallpapersafari.com/97/99/MnWulT.jpg')
+color: #fff
 transition: fade-out
+backgroundImage: url('https://cdn.wallpapersafari.com/97/99/MnWulT.jpg')
 ---
 
 # Una mirada :eyes: funcional a Java :two::one:
 
-<!-- _class: lead -->
+<!-- _backgroundImage: url('https://wallpapercave.com/wp/wp7250161.png') -->
 
 _Antonio Muñoz_
 
@@ -114,11 +114,11 @@
 * Deconstructores, nos permite acceder a los componentes de los objectos.
 
 ```java
-var area = switch (shape) {
+var area = switch (this) {
     case Square(var side) -> side * side;
     case Rectangle(var weight, var height) -> weight * height;
-    case Circle(var radious) -> Math.PI * radious^2;
-}
+    case Circle(var radious) -> Math.PI * Math.pow(radious, 2);
+};
 ```
 
 ---
@@ -140,10 +140,8 @@
 
 ```java
 public sealed interface Tree {
-
     record Node(String value, Tree left, Tree right) implements Tree { }
     record Leaf(String value) implements Tree {}
-
 } 
 ```
 
@@ -155,15 +153,34 @@
 
 ```java
 public sealed interface Optional<T> {
-
     record Empty<T>() implements Optional<T> { }
     record Present<T>(T value) implements Optional<T> {}
-
 } 
 ```
 
 ---
 
+# Tipos de datos algebraicos (IV)
+
+* Podemos representar `Json` con ADTs
+
+```java
+public sealed interface Json {
+    enum JsonNull implements Json {
+        NULL
+    }
+    enum JsonBoolean implements Json {
+        TRUE, FALSE
+    }
+    record JsonString(String value) implements Json {}
+    record JsonNumber(Number value) implements Json {}
+    record JsonObject(Map<String, Json> value) implements Json {}
+    record JsonArray(List<Json> value) implements Json {}
+}
+```
+
+---
+
 # Ejemplo
 
 * ¿Pero eso para qué me sirve?
diff --git a/snippets/Json.java b/snippets/Json.java
new file mode 100644
index 0000000..ca4642b
--- /dev/null
+++ b/snippets/Json.java
@@ -0,0 +1,17 @@
+package snippets;
+
+import java.util.List;
+import java.util.Map;
+
+public sealed interface Json {
+    enum JsonNull implements Json {
+        NULL
+    }
+    enum JsonBoolean implements Json {
+        TRUE, FALSE
+    }
+    record JsonString(String value) implements Json {}
+    record JsonNumber(Number value) implements Json {}
+    record JsonObject(Map<String, Json> value) implements Json {}
+    record JsonArray(List<Json> value) implements Json {}
+}
\ No newline at end of file
diff --git a/snippets/Optional.java b/snippets/Optional.java
new file mode 100644
index 0000000..b419128
--- /dev/null
+++ b/snippets/Optional.java
@@ -0,0 +1,6 @@
+package snippets;
+
+public sealed interface Optional<T> {
+    record Empty<T>() implements Optional<T> { }
+    record Present<T>(T value) implements Optional<T> {}
+} 
diff --git a/snippets/Shape.java b/snippets/Shape.java
new file mode 100644
index 0000000..16e20a1
--- /dev/null
+++ b/snippets/Shape.java
@@ -0,0 +1,18 @@
+package snippets;
+
+public sealed interface Shape {
+
+    default double area() {
+        var area = switch (this) {
+            case Square(var side) -> side * side;
+            case Rectangle(var weight, var height) -> weight * height;
+            case Circle(var radious) -> Math.PI * Math.pow(radious, 2);
+        };
+        return area;
+    }
+
+    record Square(int side) implements Shape {}
+    record Rectangle(int weight, int height) implements Shape {}
+    record Circle(int radious) implements Shape {}
+
+}
diff --git a/snippets/Switches.java b/snippets/Switches.java
new file mode 100644
index 0000000..0ff0a40
--- /dev/null
+++ b/snippets/Switches.java
@@ -0,0 +1,25 @@
+package snippets;
+
+public class Switches {
+
+    void method1(String input) {
+        var value = switch (input) {
+            case "a" -> 1;
+            case "b" -> 2;
+            default -> 0;
+        };
+        System.out.println(value);
+    }
+
+    void method2(Object obj) {
+        var result = switch (obj) {
+            case Integer i -> String.format("int %d", i);
+            case Long l    -> String.format("long %d", l);
+            case Double d  -> String.format("double %f", d);
+            case String s  -> String.format("String %s", s);
+            default        -> obj.toString();
+        };
+        System.out.println(result);
+    }
+    
+}
diff --git a/snippets/Tree.java b/snippets/Tree.java
new file mode 100644
index 0000000..687595d
--- /dev/null
+++ b/snippets/Tree.java
@@ -0,0 +1,6 @@
+package snippets;
+    
+public sealed interface Tree {
+    record Node(String value, Tree left, Tree right) implements Tree { }
+    record Leaf(String value) implements Tree {}
+}