Mutations problem

I almost got this working, I just need to find out why it is return true when I input mutation([“hello”, “hey”]);

My code so far

function mutation(arr) {

  var arr1 = arr[0];
  var arr2 = arr[1];
  var res = arr1.toLowerCase();
  var res2 = arr2.toLowerCase();
  var sliced = res.split("");
  var sliced2 = res2.split("");
  for (var int = 0; int < arr2.length; int++) 
      if (sliced.indexOf(sliced2[int]) >= 0)
          return true;
     return false; 

mutation(["hello", "hey"]);

Your code is always returning on the first iteration of the for loop. It’s almost an accident that all tests except one pass.

I’m not understanding what you mean.

Suppose the for loop starts its first iteration. It starts with checking if sliced.indexOf(...) >= 0. If it’s true, the return true; statement runs. If not, the return false; statement runs.

Note that returning from inside a for-loop effectively stops the for-loop from running further. Now since inside your loop it’s only either return true; or return false;, it doesn’t get to iterate through the remaining elements in arr2.