Returning an empty Array

Why am i getting an empty array?

Note: I’ve been stuck with this problem for 48 hours

``````// All valid credit card numbers
const valid1 = [4, 5, 3, 9, 6, 7, 7, 9, 0, 8, 0, 1, 6, 8, 0, 8];
const valid2 = [5, 5, 3, 5, 7, 6, 6, 7, 6, 8, 7, 5, 1, 4, 3, 9];
const valid3 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6];
const valid4 = [6, 0, 1, 1, 1, 4, 4, 3, 4, 0, 6, 8, 2, 9, 0, 5];
const valid5 = [4, 5, 3, 9, 4, 0, 4, 9, 6, 7, 8, 6, 9, 6, 6, 6];

// All invalid credit card numbers
const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5];
const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3];
const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4];
const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5];
const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4];

// Can be either valid or invalid
const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4];
const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9];
const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3];
const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3];
const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3];

// An array of all the arrays above
const batch = [valid1, valid2, valid3, valid4, valid5, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5];

const validateCred = array => {
// variable declaration
let poppedValue = [];
// pop the last digit of the array
poppedValue.push(array.pop());

// reverse the array
array.reverse();
// Multiply the digits in oddPosition
let multipliedArray = array.map((e, index) => index % 2 ===0 ? e * 2 : e);

// subtruct 9 from values > 9
multipliedArray = multipliedArray.map(e => e > 9 ? e - 9 : e);
// add all the values in the array including the popped Array
// first concat the array with the popped value
multipliedArray = multipliedArray.concat(poppedValue);
// Add all the values in the multiplied array
multipliedArray = multipliedArray.reduce((accumulator, currentValue) => accumulator + currentValue);

// check value % 10
multipliedArray = multipliedArray % 10 === 0 ? 'Valid' : 'Invalid';

return multipliedArray;

}

// create a function to loop through all cards
let invalidCardsArray = [];
const findInvalidCards = invalidCards => {

for(let i = 0; i < invalidCards.length; i++){
if(validateCred(invalidCards[i]) === true){
invalidCardsArray.push(invalidCards[i]);
}
}

return invalidCardsArray;

}

console.log(findInvalidCards(batch));
``````

Output

What condition has to be met for a value to be added to the array? Is it ever met? You could add a few console.log() statements to see where things change from what’s expected. For example, you could start with logging the result of the condition in question here. Immediately before your `if` statement, add a call to `console.log` with the same condition you are checking. Is the value what you’re expecting?

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