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 checkDigit(num){
  const secondDigit = num % 10;
  if(num >= 10){
    return secondDigit + 1;
  }else{
    return secondDigit;
  }
}
function makePayloadNums(arr){
  let payloadArr = [];
  for(let i = 0; i < arr.length-1; i++){
    payloadArr[i] = arr[i];
  }
  return payloadArr;
}

function sumOfDigits(arrayOfDigits){
  let arr = makePayloadNums(arrayOfDigits);
  let sum = 0;
  let j = 0;
  for(let i = arr.length - 1; i >= 0; i--){
    let digit = 0;
    j = (arr.length-1) - i;
    if((j % 2) === 0){
      digit = checkDigit(arr[i] * 2);
      sum += digit;
    }else{
      digit = arr[i];
      sum += digit;
    }
  }
  return sum;
}
function calculateCheckDigit(num){
  return ( (10 - (num % 10)) % 10  )
}

function validateCred(array){
  const sum = sumOfDigits(array);
  const calculatedDigit = calculateCheckDigit(sum);
  const checkDigit = array[array.length-1];
  if(calculatedDigit === checkDigit){
    return true;
  }else{
    return false;
  }
}
function findInvalidCards(arrOfCardsNums){
  let invalidCards = [];
  for(let i=0; i<arrOfCardsNums.length; i++){
    if(validateCred(arrOfCardsNums[i]) === false){
      invalidCards.push(arrOfCardsNums[i]);
    }
  }
  return invalidCards;
}
function findCompany(arr, digit){
  switch (digit) {
    case 3:
      if(arr.includes('Amex') === false){
        arr.push('Amex');
      }
      break;
    case 4:
      if(arr.includes('Visa') === false){
        arr.push('Visa');
      }
      break;
    case 5:
      if(arr.includes('Mastercard') === false){
        arr.push('Mastercard');
      }
      break;
    case 6:
      if(arr.includes('Discover') === false){
        arr.push('Discover');
      }
      break;
  }
  return arr;
}
function idInvalidCardCompanies(invalidCards){
  const invalidCompanies = [];
  for(let i = 0; i < invalidCards.length; i++){
    findCompany(invalidCompanies, invalidCards[i][0]);
  }
  return invalidCompanies;
}
let invalidCardsArray = findInvalidCards(batch);
console.log(idInvalidCardCompanies(invalidCardsArray));