ous code block.

            ```javascript; runnable
            var result = 0;
            for (var i = 10; i <= this.number; i++) {
                result += i * i;
            }
            return result;
            ```

            ```javascript; runnable
            this.number *= 2;
            return this.number;
            ```

            Try playing around with running these code samples in different orders, to see how the results change.

            ## Working with data

            If you ha