A boolean should be returned instead of a string.

I'm also confused. So "NORTH" "WEST" "SOUTH" "EAST" is irreducible because it has no opposite AND consecutive directions, but not all the opposite directions in "NORTH", "SOUTH", "SOUTH", "EAST", "WEST", "NORTH", "WEST" are consectuive either--so why does this second example reduce to "WEST"?

Haha, thanks, now I know I'm not crazy, but I still get an error from the test cases for some reason.

I've copy and run your code, it works and passed all tests. So no problem ;-)

Oh sorry, I see now that I have no example test cases. These are the fixed tests:

Test.assertEquals([1,2,[2,4]].average(),2);
Test.assertEquals([1,2,3].average(),2);
Test.assertEquals([1,2,'3 doors down'].average(),2);
Test.assertEquals([0.4, '1.6'].average(),1);
Test.assertEquals([0.4, [1,[2,4,6,[8,9]]]].average(),1.73125);
Test.assertEquals([1, 2, 3, ['3', ['2 doors', 9, ['1.6']]]].average(),2.4);

Yeah, I believe it's the last fixed test case

Hi

Are you talking about the last fixed test case? There are 30 random test cases too, so I'm not entirely sure which one you are referring to.

@ArcaneIntegers,

Ok, thanks!

hi, thanks for the suggestion, I'll update it when im on my computer

Hi, the reason you're getting this problem is that you forgot to declare the "i" you are using in the for loop as a variable. As a result, the "i" is now a global variable, and each time you call flatten, "i" gets reset to 0.

always use for(var i = 0;i < x.length;i++){....}