The use of callback functions is deprecated in MongoDB V. 7.0

Unit_0/lesson_1/0-server/javascript1.js

@@ -0,0 +1,2 @@
+(function foo() { console.log('foo was executed!');
+})();

Unit_0/lesson_1/0-server/javascript2.js

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+var foo = 123; 
+if (true) { 
+    (function() { // create a new scope with var 
+        var foo = 456;
+    })();
+}
+console.log(foo); // 123;
+/*
+var foo = 123;
+if (true) {
+    (function () { // create a new scope
+        var foo = 456;
+    })();
+}
+console.log(foo); // 123; 
+*/

Unit_0/lesson_1/0-server/javascript4.js

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+'use strict'
+
+var users = [
+    {
+        name: "John Wayne",
+        gender: "male"
+    },
+    {
+        name: "Mary Monro",
+        gender: "female"
+    },
+    {
+        name: "Charles Bronson",
+        gender: "male"
+    }
+];
+
+const showUsers = () => {
+    users.forEach (user => {
+        console.log(`user name is ${user.name}`);
+    });
+};
+
+const addUsers = (name, gender ) => {
+    console.log("in addUser");
+    var newuserName = name;
+    console.log("name " + newuserName);
+    var newuserGender = gender;
+
+    users.push({name: newuserName, gender: newuserGender});
+
+    };
+showUsers();
+addUsers( "John Doe",  "male");
+showUsers();
+