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 = (array) => {
  let testArray = [];
  testArray = array.slice();
  testArray.pop();
  testArray.reverse(); 



  for (let i = 0; i < testArray.length; i+=2) {
    testArray[i] *= 2;
  }

  for (let i = 0; i < testArray.length; i++) {
    if (testArray[i] > 9) {
      testArray[i] -= 9;
    }
  }
    
    let sum = testArray.reduce((a,b) => a+b, 0);

    let num1 = sum + array.pop();
    if (num1 % 10 === 0) {
      return true;
    } else {
      return false;
    }
  };

const findInvalidCards = (card) => {
  let invalidCards = [];
  let validCards = [];
  for (let j= 0; j < card.length; j++) {
    if (validateCred(card[j]) === false) {
        invalidCards.push(card[j]);
    } else {
      validCards.push(card[j]);
    }
  }
  return invalidCards;
}


const idInvalidCardCompanies = (card) => {
  let companies = [];
 for (let k = 0; k < card.length; k++){
   if(validateCred(card[k]) === false) {
     switch(card[k][0]) {
       case 3:
         return 'Amex (American Express)';
         break;
       case 4:
         return 'Visa';
         break;
       case 5:
         return 'MasterCard';
         break;
       case 6:
         return 'Discover';
         break;
       default:
         return 'Company not found';
         break;
     }
     companies.push(card[k]); 
   }
   
  }
  return companies;
}

console.log(idInvalidCardCompanies(batch));