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];

// 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 = cardNumber => {
  var newList = cardNumber.slice(0, -1);
  var revList = [];
  var doubledList = [];
  
  for (let i = newList.length - 1; i >= 0; i--) {
    revList.push(newList[i]);
  }
  for (let q = 0; q <= revList.length - 1; q += 2) {
    if (revList[q] * 2 > 9) {
      doubledList.push((revList[q] * 2) - 9);
      //console.log((revList[q] * 2) - 9);
        }
    else {
      doubledList.push(revList[q] * 2);
    }
  }
    for (let z = 1; z <= revList.length - 1; z += 2) {
      doubledList.push(revList[z]);
    }
  var totalSum = 0
  for (let x = 0; x <= doubledList.length - 1; x++) {
    totalSum += doubledList[x];
  }
  totalSum += cardNumber[cardNumber.length - 1];
  
  /*console.log(newList);
  console.log(revList);
  console.log(doubledList);
  console.log(totalSum);
  */
  
  if (totalSum % 10 === 0) {
    return true;
  }
  else {
    return false;
  }
  
}

//console.log(validateCred(mystery5));
var valCards = [];
var invalCards = [];
const findInvalidCards = cardArray => {
  for (let i = 0; i < cardArray.length; i++) {
    if (validateCred(cardArray[i]) === true) {
      valCards.unshift(cardArray[i]);
    }
    else {
      invalCards.unshift(cardArray[i]);
    } 
  }
  return valCards;
}

findInvalidCards(batch);

const idInvalidCardCompanies = badCards => {
  var badCardCompanies = [];
  var noDoubles = [];
  //noDoubles = badCardCompany.length;
  for (let i = 0; i < badCards.length; i++) {
    if (badCards[i][0] === 3) {
      badCardCompanies.unshift('American Express');
    }
    else if (badCards[i][0] === 4) {
      badCardCompanies.unshift('Visa');
    }
    else if (badCards[i][0] === 5) {
      badCardCompanies.unshift('MasterCard');
    }
    else if (badCards[i][0] === 6) {
      badCardCompanies.unshift('Discover');
      }
    else {
      badCardCompanies.unshift('Company not found');
    }
  }
uniqueList = [...new Set(badCardCompanies)];
  console.log(uniqueList);
}
  
idInvalidCardCompanies(invalCards);