// Example of var
        var name = "Alice";
        if (true) {
            var name = "Bob"; // Re-declares and changes the same variable
        }
        console.log(name); // Outputs: Bob

        // Example of let
        let age = 30;
        if (true) {
            let age = 25; // Creates a new variable in the block scope
        }
        console.log(age); // Outputs: 30

        // Example of const
        const birthYear = 1990;
        // birthYear = 1991; // Error: Assignment to constant variable