Dear author, I have spent some time figuring it out. Because empty array is not a squared empty array, if you asked for simple equality then yes you are right []=[] but you have asked about squares of original array. Please add it to Kata's description because it is completely unclear

if you say so :)
but I think that what you said ( "Same" means, here, that the elements in b are the elements in a squared regardless of the order)