This is the result when i run it on my local machine: 3 [0, 1, 1, 2, 3, 5, 8, 13] It returns fib(4) correctly as 3 for the task at hand but when I take this code to the code wars console it only returns None. The 6 terminates the fib series at depth 6 plus two, as seen in the array append, i.e. [8, 13], appreciate your speedy response to the issue I am facing...