// Example of var
        function varExample() {
            if (true) {
                var x = 10;
            }
            console.log(x); // 10, because var is function-scoped
        }
        varExample();

        // Example of let
        function letExample() {
            if (true) {
                let y = 20;
            }
            console.log(y); // ReferenceError, because let is block-scoped
        }
        letExample();