describe("demo", function() {
    describe("demo reverse", function(){
        it("canary test", function() {
            expect(3+5).toEqual(8);
        });
        it("canary test 2", function() {
            var s = "abc";
            expect(s).toEqual("abc");
        });
        it("demo reverse", function() {
            var s = "abc123";
            var result = myReverse(s);
            expect(result).toEqual("321cba");
        });
    });
});

@@ -163,117 +163,8 @@
     
-it(%22canary test 2%22, function() %7B%0A            var s = %22abc%22;%0A            expect(s).toEqual(%22abc%22);%0A        %7D);
 %0A   
@@ -212,19 +212,21 @@
         
-var
+const
  s = %22ab
@@ -248,11 +248,13 @@
     
-var
+const
  res

use const ... still unclear which version is supported