don't know what to do with the first basic question
not correct [], 1 given - Expected: [], instead got: ["foo","bar","foobar","barfoo","foofoo","barbar"]

why fun(arr, 1) should return an empty array?

I passed all the test cases, only failed at this one.

anyone?

That's true. I didn't search for similar task before I publish.
thx for your feedback

Thanks for your feedback. I'll add expected and return value for failed test cases asap.

The output ["b", "c", "a", "d", "e"] for arr.move(0,2) seems to be right, not really sure what's the problem here. maybe there's some issue with my test function? I use this function to check if the output array is correct or not.

function equal(a, b) {
  var i = a.length;
  if (i != b.length) return false;
  while (i--) {
      if (a[i] !== b[i]) return false;
  }
  return true;
};

use case:

var arr = ['a', 'b', 'c', 'd', 'e'];
equal(arr.move(0,2), ["b", "c", "a", "d", "e"]) // should be true