// 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,
];
// Add your functions below:
const validateCred = (array) => {
let arr = array.slice();
let sum = 0;
let digit = arr[arr.length - 1];
for (let i = arr.length - 1; i >= 0; i--) {
if (i % 2 === 0) {
arr[i] = arr[i] * 2;
if (arr[i] > 9) {
arr[i] -= 9;
}
} else {
}
}
for (let i = 0; i < arr.length; i++) {
sum += arr[i];
}
if (sum % digit === 0) {
return true;
} else {
return false;
}
};
const findInvalidCards = (array) => {
let invalidArray = [];
let validArray = [];
array.forEach((arr) => {
if (validateCred(arr)) {
validArray.push(arr);
} else {
invalidArray.push(arr);
}
});
console.log("valid:");
console.log(validArray);
console.log("Invalid:");
console.log(invalidArray);
return invalidArray;
};
const idInvalidCardCompanies = (array) => {
let cardCompanies = [];
for (const card of array) {
let firstDigit = card[0];
let companyName;
switch (firstDigit) {
case 3:
companyName = "Amex (American Express)";
break;
case 4:
companyName = "Visa";
break;
case 5:
companyName = "Mastercard";
break;
case 6:
companyName = "Discover";
break;
default:
console.log('Company not found');
continue;
}
if (!cardCompanies.includes(companyName)) {
cardCompanies.push(companyName);
}
}
return cardCompanies;
};
//console.log(validateCred(valid3));
//findInvalidCards(batch);
console.log('Cards: ' + idInvalidCardCompanies(findInvalidCards(batch)));
Ktotz
