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:
// Checkpoint 3
const validateCred =arr =>  {

  let newArray = [];
  let newArray2 = [];
  
  newArray.push(arr[arr.length -1]);
  for (let i=(arr.length -2); i >=0 ; i-- ){
    if (((i - arr.length) % 2) === 0)
   { newArray.push((arr[i]) * 2);} else {newArray.push((arr[i]) );}
  };
  newArray.forEach(num => {
    (num > 9) ? newArray2.push(num -9) : newArray2.push(num)
  })
  let sum = newArray2.reduce((x, y) => x + y);


  return (sum % 10) === 0;
};

//Checkpoint 4
 const findInvalidCards = arrays => {
   let invalidCards = []
   for (let array of arrays){
     let check = validateCred(array);
     if (!check) { invalidCards.push(array);}}
     return invalidCards;
 }


//Checkpoint 5
 const idInvalidCardCompanies = invalidCards => {
    let companies = [];
   for (let card of invalidCards){
     let company = '';
     switch (card[0]){
       case 3: company = 'Amex (American Express)';
       break;
       case 4: company = 'Visa';
       break;
       case 5: company = 'Mastercard';
       break;
       case 6: company = 'Discover';
       break;
       default : company = 'Company not found' 
     };
     if (!companies.includes(company)){companies.push(company);};
   };
   return companies;
 }

invalidCards = findInvalidCards(batch);
console.log(findInvalidCards(batch));
console.log(idInvalidCardCompanies(invalidCards));