<!-- BEGIN COPY / PASTE -->
        // Use 'let' and 'const' instead of 'var'
        const pi = 3.14;
        let radius = 5;

        // Use descriptive variable names
        let areaOfCircle = pi * radius * radius;

        // Use template literals for string concatenation
        console.log(`The area of the circle is: ${areaOfCircle}`);

        // Use arrow functions for concise syntax
        const square = (x) => x * x;
        console.log(square(4));

        // Use strict equality '===' to avoid type coercion
        if (radius === 5) {
            console.log("Radius is exactly 5");
        }
        <!-- END COPY / PASTE -->