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:
var validateCred = arr => {
   var sum = 0;
for (var i = arr.length -1; i >= 0; i--){
  var temp = arr[i];
  // console.log(temp)
  if (arr.length % 2 == 0) { 
    if(i % 2 == 0 ){
      temp *= 2; 
      if (temp > 9){
          temp -= 9;
      }
    }
  } 
  else{
    //console.log(i);
    if(i % 2 != 0 ){
      temp *= 2; 
      if (temp > 9){
          temp -= 9;
      }     
     // console.log(i);
     // console.log(temp)
    }
  }  
     //console.log(temp) 
  sum += temp; 
 //console.log(sum)
}
if( sum % 10 == 0){
  return true;
} else{
  return false;
}
};

// console.log(validateCred(valid3));
// console.log(validateCred(valid2));
// console.log(validateCred(valid3));
// console.log(validateCred(valid4));
// console.log(validateCred(valid5));
// console.log(validateCred(mystery1));
// console.log(validateCred(mystery2));
// console.log(validateCred(mystery3));
// console.log(validateCred(mystery4));
// console.log(validateCred(mystery5));
// console.log(validateCred(invalid2));

var findInvalidCards = arr => {
  var newArr = [];
  arr.forEach(a => {
    if (validateCred(a) === false){
      newArr.push(a);   
    }  
  });
   return newArr;
   //console.log(newArr);
 // console.log(newArr.length);
};
var invalidCard = findInvalidCards(batch);
console.log(invalidCard)

var idInvalidCardCompanies = arr => {
  var cardCompanies = [];
  arr.forEach( a => {
    switch (a[0]){
      case 3 :
      if(!cardCompanies.includes('Amex'))       {
          cardCompanies.push('Amex');
        }
        break;   
      case 4 :
      if(!cardCompanies.includes('Visa'))       {
          cardCompanies.push('Visa');
        } 
        break;  
      case 5 :
     if(!cardCompanies.includes('MasterCard'))       {
          cardCompanies.push('MasterCard');
        } 
        break;  
      case 6 :
      if(!cardCompanies.includes('Discover'))       {
          cardCompanies.push('Discover');
        } 
        break;  
      default :
      if(!cardCompanies.includes('Company not found'))       {
          cardCompanies.push('Company not found');
        } 
        break;  
    }
  })
  return cardCompanies;
  console.log(cardCompanies);
}
console.log(idInvalidCardCompanies(invalidCard))