Codecademy export

main.js

// 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];


const string1 = '5562373108309246';
// 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 = arr => {
  if (typeof arr === 'string') {
    arr = arr.split('').map(Number);
  };
  const sum = arr
  .map((n, i) => i % 2 === arr.length % 2 ? fixNum(n * 2) : n)
  .reduce((acc, n) => acc += n, 0);

  return sum % 10 === 0;
};

const fixNum = n => n > 9 ? n - 9 : n;

console.log(validateCred(string1))

const findInvalidCards = arr => {
  return arr.reduce((acc, card) => {
    if(!validateCred(card)) {
    acc.push(card);
    } 
    return acc;
  }, []);
};
 
// console.log(findInvalidCards(batch).length) // 8;

const invalidCards = findInvalidCards(batch);

const idInvalidCardCompanies = invCards => {
  const newArr = invCards.map((card) => {
    if (card[0] === 3) { return 'Amex';}
    if (card[0] === 4) { return 'Visa';}
    if (card[0] === 5) { return 'Mastercard';}
    if (card[0] === 6) { return 'Discover';}
    console.log('Company not found');
  }, []);
   return newArr.reduce((acc, comp) => {
     if (!acc.includes(comp)) {
        acc.push(comp);
     } 
     return acc;
   }, []);
};

console.log(idInvalidCardCompanies(invalidCards));