Fixed.

The user can modify the input in JavaScript.

Added the random tests.

dont write a spoiler here .....

for(i=0; i<arrLength; i++)
if(arr[i] == arr[i+1])

This is wrong.

Another symptom of the issue above. Closing.

Fixed.

actually ive just resolved with this issue with change to node 8

Click reset, try again.

No output was produced.
Make sure tests are written properly using describe and it (required for Node 10).

what is this error? can anyone tell? based on console.log my output is correct

Fixed.

All these points are issues, and they have been raised already.

Still no random tests in JavaScript.

Fixed.