Modifying input still causes problems in sample tests (at least in JS version).

Still true in sample tests.

• the default value for count isn't properly tested: I mistyped it but my solution passed.
• the test suite needs fixed tests too... The fixed tests should be at the beginning of the test suite, but only edge cases are present. So needs more fixed tests.

(ruby)

All's fine now.

Try again.

Nope. I didn't modify the target, and made a copy of source, but a couple of such cases were generated almost on every attempt.

Edit: I still get such cases wrong.

Edit 2: in case of target=[], the expected result is source without its last element. Considering how all fixed tests with target=[] have 1-element-long source array, the reference solution passes because it copies n-1 elements from source to target which happens to be exactly 0 elements.

Edit 3: confirmed, the reference solution returns first n-1 elements of source array in case target is empty.

Not anymore.

Not anymore.

I think this one is related to the input mutation problem, is it?

Inputs can be modified in Ruby.

Inputs can be modified in JavaScript.

if the target array is empty, than an empty array should be returned.

JavaScript:

target=[], source=[41, 27, 90, 6, 65], n=3

Actual:   []
Expected: [41, 27, 90, 6]

This was fixed.

.

var target = [];
var source = [68,60,45,31,3,86,94,7,90,14,29,86,92,96,41,73,20,58,41,91,95,45,82,4,1,22,44,16,49,94,22,90,50,64,6];
var count = 2;

merge_every(target, source, count);

expected = [68, 60, 45, 31, 3, 86, 94, 7, 90, 14, 29, 86, 92, 96, 41, 73, 20, 58, 41, 91, 95, 45, 82, 4, 1, 22, 44, 16, 49, 94, 22, 90, 50, 64];
got = [];

There is nothing in target, so all positions are the last position. So nothing should be added. So the expected output should be an empty array.