From 9ff4ab61d7bc84329a17b447b24b9c2c631fa7ba Mon Sep 17 00:00:00 2001
From: "Luiz F. Picolo" <luizpicolo@gmail.com>
Date: Thu, 12 Sep 2024 08:29:05 -0400
Subject: [PATCH] Commit inicial

---
 ex1.js | 14 ++++++++++++++
 ex2.js | 29 +++++++++++++++++++++++++++++
 ex3.js | 20 ++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 ex1.js
 create mode 100644 ex2.js
 create mode 100644 ex3.js

diff --git a/ex1.js b/ex1.js
new file mode 100644
index 0000000..f54c917
--- /dev/null
+++ b/ex1.js
@@ -0,0 +1,14 @@
+class Logger {
+  log(message) {
+    console.log(`Log message: ${message}`);
+  }
+}
+
+function executeTask(task, logger) {
+  logger.log("Iniciando tarefa...");
+  task();
+  logger.log("Tarefa concluída!");
+}
+
+const logger = new Logger();
+executeTask(() => console.log("Executando tarefa principal..."), logger);
diff --git a/ex2.js b/ex2.js
new file mode 100644
index 0000000..b25336d
--- /dev/null
+++ b/ex2.js
@@ -0,0 +1,29 @@
+class UserService {
+  constructor(database) {
+      this.database = database;
+  }
+
+  getUser(id) {
+      return this.database.find(user => user.id === id);
+  }
+}
+
+class Database {
+  constructor() {
+      this.users = [
+          { id: 1, name: 'Alice' },
+          { id: 2, name: 'Bob' }
+      ];
+  }
+
+  find(id) {
+      return this.users.find(id);
+  }
+}
+
+// Inversão de Controle a dependência (Database) é injetada no UserService
+const database = new Database();
+const userService = new UserService(database);
+
+const user = userService.getUser(1);
+console.log(user); // { id: 1, name: 'Alice' }
diff --git a/ex3.js b/ex3.js
new file mode 100644
index 0000000..0c2d0d0
--- /dev/null
+++ b/ex3.js
@@ -0,0 +1,20 @@
+class Database {
+  query(sql) {
+    console.log(`Executando consulta: ${sql}`);
+  }
+}
+
+class UserService {
+  constructor(database) {
+    this.database = database;  // Dependência injetada
+  }
+
+  getUser(id) {
+    this.database.query(`SELECT * FROM users WHERE id = ${id}`);
+  }
+}
+
+const database = new Database();
+const userService = new UserService(database);
+
+userService.getUser(1);  // Executa com a dependência injetada