JavaScript Data Types
<!DOCTYPE html> <html> <body> <h2>Primitive values in action</h2> <script> let name = "Ada"; // string let age = 36; // number let isMentor = true; // boolean let salary; // undefined (never assigned) let manager = null; // null (empty on purpose) console.log(typeof name); // "string" console.log(typeof age); // "number" console.log(typeof isMentor); // "boolean" console.log(typeof salary); // "undefined" </script> </body> </html>