Hello All,
This is still very much a work in progress. I am still trying to make sure I understand what I actually coded. Any feedback would be greatly appreciated.
Codepen has been updated. It should match the below Gist
// 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:
let isValid = false;
function validateCred(arr) {
let copyArr = Array.isArray(arr)
? arr.slice().reverse()
: arr.toString().split("").reverse().map(Number); // Check if arr is an array, if not convert it to an array
let sum = 0;
let isEven = false;
for (let i = 0; i < copyArr.length; i++) {
let digit = parseInt(copyArr[i]);
if (isEven) {
digit *= 2;
if (digit > 9) {
digit -= 9;
}
}
sum += digit;
isEven = !isEven;
}
isValid = sum % 10 === 0;
console.log(
`The card number: ${arr} has been validated. Is it valid? Result: ${isValid}`
);
return arr;
}
function findInvalidCards(batch) {
let invalidCards = [];
for (let i = 0; i < batch.length; i++) {
validateCred(batch[i]); // Run validateCred() to update isValid
if (!isValid) {
invalidCards.push(batch[i]);
}
}
console.log("The below card numbers are not valid:");
return invalidCards;
}
function idInvalidCardCompanies(invalidNumbers) {
let companies = [];
// Convert single array or string to an array of arrays
if (!Array.isArray(invalidNumbers[0])) {
invalidNumbers = [invalidNumbers];
} else if (typeof invalidNumbers === "string") {
invalidNumbers = [invalidNumbers.split("").map(Number)];
}
for (let i = 0; i < invalidNumbers.length; i++) {
let firstDigit = invalidNumbers[i][0];
switch (firstDigit) {
case 3:
if (!companies.includes("Amex")) {
companies.push("Amex");
console.log(invalidNumbers[i][0]);
}
break;
case 4:
if (!companies.includes("Visa")) {
companies.push("Visa");
console.log(invalidNumbers[i][0]);
}
break;
case 5:
if (!companies.includes("Mastercard")) {
companies.push("Mastercard");
console.log(invalidNumbers[i][0]);
}
break;
case 6:
if (!companies.includes("Discover")) {
companies.push("Discover");
console.log(invalidNumbers[i][0]);
}
break;
default:
console.log(invalidNumbers[i][0]);
console.log("Company not found");
}
}
return companies;
}
console.log(validateCred(invalid1));
console.log(findInvalidCards(batch));
// console.log(idInvalidCardCompanies(findInvalidCards(batch)));
// console.log(idInvalidCardCompanies(validateCred(invalid2)));
// console.log(idInvalidCardCompanies(invalid2));
// console.log(idInvalidCardCompanies(validateCred(invalid1)));
// console.log(validateCred(valid1));
// console.log(validateCred(invalid1));