D'oh! Of course, thank you!

That solved it thank you!

Thanks, solved it now! So because I assigned array as the argument to the new function array sum in a loop I would have to expilicity state an array is passing through it.

Sorry Chrono, I still do not understand, it's just the even tests that aren't passing, why is that?

Ah right, okay thank you!

There appears to be an error with the solution

let multiply = (a, b) => a * b;

When running sample tests it shows an error saying;

should test for something
This is just an example of how you can write your own TDD tests - Expected: 'expected', instead got: 'actual'

However the final attempt works fine as expected. Why is this?

Best regards,
Shahe

I must ask a question which probably has a very obvious solution. Why must the function be called replace in this kata? It appears to be directly tied to the regular expression method although I cannot see why that should be the case?

Thanks!