it seems so, failure in the test cases.
the solution should not have passed.

The tests weren't functional, so anything passed.

I used this solution just to see what I could learn, and was surprised to see it work.

Wouldn't a value of 4 for size give an answer of 10101010? Where 1010 would be expected.

I think this might not work according to documentation.

In your code if num == 2, result is "1010"
Expected is "10"

Really cool solution

OK, good!

Task is quite easy but i tottaly forgot Java specially "import java.util.function.BiFunction;"

Ok o will try to import and see

Please Fixed tests or Random tests? Do you import all what is needed? Some guys passed the katas in Java without problem. I just tried it and it worked fine.

I recive 4 errors after i compile code. This errors are connected with func tiona that was providet in Java. Could you help pls.

/Operarray.java:24: error: illegal start of type
public static long[] operArray(... operator, long[] arr, long init) {
^
/Operarray.java:24: error: ')' expected
public static long[] operArray(... operator, long[] arr, long init) {
^
/Operarray.java:24: error: expected
public static long[] operArray(... operator, long[] arr, long init) {
^
/Operarray.java:24: error: expected
public static long[] operArray(... operator, long[] arr, long init) {
^
4 errors