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:
function validateCred(array){
  let sum = 0;
  let z = 0;
  let invertedArray = [];

  for (let i = array.length-1; i>=0; i--){
    invertedArray[z] = array[i];
    z++;
  };
  
  for (let i = 0; i < invertedArray.length; i++){
    let isOdd = (i%2 != 0);
    if (isOdd){
      let temp = invertedArray[i]*2;
      if (temp > 9){
        temp -= 9;
        sum += temp;
      }else {
      sum += temp;
    }
    }else {
    sum += invertedArray[i];
    }
  }
  let isValid = (sum%10 === 0);
  return isValid;
}

function findInvalidCards(nestedArray){
  let validCards = [];
  let invalidCards = [];
  for (let i = 0; i < nestedArray.length; i++){
      if (validateCred(nestedArray[i])){
        validCards.push(nestedArray[i]);
      }else {
        invalidCards.push(nestedArray[i]);
      }
    }
  return invalidCards;
}

function idInvalidCardCompanies(array){
  let cardCompany = [[0, 'Amex'], [0, 'Visa'], [0, 'MasterCard'], [0, 'Discover']];
  let invalidCards = findInvalidCards(array);
  for (let i = 0; i < invalidCards.length; i++){
   if (invalidCards[i][0] == 3){
     cardCompany[0][0]++;
    }else if (invalidCards[i][0] == 4){
      cardCompany[1][0]++;
    }else if (invalidCards[i][0] == 5){
      cardCompany[2][0]++;
    }else if (invalidCards[i][0] == 6){
      cardCompany[3][0]++;
    }else {
      console.log("Company not found!")
      break;
    } 
    }
    return cardCompany;
   }