Colorsheme Playground

        function fib(n) {
          let [first, second] = [0, 1];
          return function() {
            console.log(first);
            [first, second] = [second, first + second];
          }
        }

        console.log("The Fibonacci Sequence");
        const f = fib();
        for (let i = 0; i < 10; i++) {
          f();
        }