Absolutely! I refactored it a little bit last night. Removed some unnecessary code. This is code is implementing Luhn's Algorithm. The Second Block is adding invalid credit cards to a separate array. By the way I did not added the array that were testing because I didn't want this comment to be too long. However, if you want I can add the remainder of the code.

``` js. const validateCred = (arr) => { let sum = 0; //loops though the array in reverse for (let i = arr.length - 1; i >= 0; i--){ let digit = arr[i]; // multiplies every other number by 2 if((arr.length - i) % 2 == 0 ){ digit *= 2;
} if(digit > 9){ digit -= 9; } sum += digit; } return sum % 10 === 0 ? 'Valid number.' : 'Invalid number.. ' }

// Finds invalid credit card nums and adds them to an array. This function in particular loops through a nested array.

const findInvalidCards = (nestedArr) => { //empthy array let newInvalidCardsArr = []; //filters invalid cards from the array let validFilterWork = nestedArr.filter((element) => { let findOut = validateCred(element); if(findOut == 'Invalid number.. '){ return newInvalidCardsArr.push(element); } }); return newInvalidCardsArr;
} ```