Update some of the exercises

examples/characters/src/character.js

@@ -0,0 +1,26 @@
+import { Person } from './person.js';
+import { rollDice } from './roll-dice.js';
+
+export class Character extends Person {
+  constructor(firstName, lastName, role) {
+    super(firstName, lastName);
+
+    this.role = role;
+    this.level = 1;
+
+    this.createdAt = new Date();
+    this.lastModified = this.createdAt;
+
+    this.strength = rollDice(4, 6);
+    this.dexterity = rollDice(4, 6);
+    this.intelligence = rollDice(4, 6);
+    this.wisdom = rollDice(4, 6);
+    this.charisma = rollDice(4, 6);
+    this.constitution = rollDice(4, 6);
+  }
+
+  levelUp() {
+    this.level++;
+    this.lastModified = new Date();
+  }
+}