cool thanks!
Why does it need a starting value of 0? it already starts at 0 doesn't it?

[0,1,2,3].reduce((a,b)=>a+b);

is the same as

[0,1,2,3].reduce((a,b)=>a+b, 0);

['A', '2', '3', '4', '5', '6', '7', '8', '9', 'T', 'J', 'Q', 'K']```

NO they're not.

Tests are passing them as [3,9,"A",5,"T",8,2,4,"Q",7,"J",6,"K"]

How has no one picked this up?

Expected: '[1, 0]', instead got: '[]'
Random test case on submit wrong, had to resubmit to pass

Does anyone know how I can remove this kata as 'completed' from my account? A friend completed it for funs sake and it doesn't reflect my level so would like it removed

@AcesOfGlory thank you for the tip. I've just done it. I have one question though, at first I was setting my default parameter to false and then checking for it within an if, and it was failing. Then (after 2 keyboard smashing frustrating hours) I set the default parameter to 'STOP' and checked for it with an if exactly like before and it passed. Why?

Could someone please give me an example of what could be passed in as pred?
Thanks

Right that was weird, when I clicked submit a second time I had two errors, then when I clicked submit a third time all my tests passed. Something wrong with tests I believe.