@@ -0,0 +1,42 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+// Value Object
+
+class UserName {
+  value;
+  constructor(value) {
+    this.value = value;
+    if (typeof value !== 'string') {
+      throw new Error('Name expected to be string');
+    }
+    if (value.length < 2) {
+      throw new Error('Name is too short');
+    }
+    if (value.indexOf(' ') === -1) {
+      throw new Error('Name is too simple');
+    }
+  }
+}
+
+// Usage
+
+try {
+  const name1 = new UserName('Marcus Aurelius');
+  console.log({ name1 });
+} catch (error) {
+  console.error(error);
+}
+
+try {
+  const name2 = new UserName('Marcus');
+} catch (error) {
+  console.error(error);
+}
+
+try {
+  const name3 = new UserName('M');
+} catch (error) {
+  console.error(error);
+}
@@ -0,0 +1,36 @@
+// Value Object
+
+class UserName {
+  constructor(public value: string) {
+    if (typeof value !== 'string') {
+      throw new Error('Name expected to be string');
+    }
+    if (value.length < 2) {
+      throw new Error('Name is too short');
+    }
+    if (value.indexOf(' ') === -1) {
+      throw new Error('Name is too simple');
+    }
+  }
+}
+
+// Usage
+
+try {
+  const name1 = new UserName('Marcus Aurelius');
+  console.log({ name1 });
+} catch (error) {
+  console.error(error);
+}
+
+try {
+  const name2 = new UserName('Marcus');
+} catch (error) {
+  console.error(error);
+}
+
+try {
+  const name3 = new UserName('M');
+} catch (error) {
+  console.error(error);
+}