cc checker

gistfile1.txt

// 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 using luhn algorithm to validate card number
let validateCred = (arr) =>{

//array to store sum of input card
  let sumUp = [];
  
//loop that starts from right of array and passes through luhn steps
let count = 1;
  for (let i = arr.length - 1; i >= 0; i--){

        //conditional that checks array element is even
        if (count != 1 && count % 2 === 0){
          //conditional to see if number is over 9 after *2
          if (arr[i]*2 > 9){
            //sends value to sumUp 
            sumUp.push(arr[i]*2 - 9);
          }else{
            //sends value to sumUp
            sumUp.push(arr[i]*2);
          }  
         }
         else{
           //sends value to sumUp
           sumUp.push(arr[i]);
        }
        count++
    }
    //adds up the inputed array and stores it in sumUp
    sumUp = sumUp.reduce((a, b) => a + b, 0);
    //checks if sum has remainder of 0 to see if valid number;
      if (sumUp % 10 === 0){
        //console.log('Its a valid card number!')
        return true;
      }else{
        //console.log('Invalid credit card number')
        return false;
      }
      //console.log(validateCred(valid3)
  } 
//variable that stores the invalid cards

  //function to create an array of invalid credit cards
let findInvalidCards = (nestedArray) => {
let invalidCards = [];
  //rotates from left-right through the nested array
    for (let j = 0; j < nestedArray.length; j++){   
      //passes batch through validateCred function to see which cards are invalid   
      if (validateCred(nestedArray[j]) === false) {
        //pushes invalid cards from array to blank array
        invalidCards.push(nestedArray[j]);
      }
    }
  
    return (invalidCards);
  
}
//console.log(findInvalidCards(batch));
const invalid = findInvalidCards(batch);

let idInvalidCardCompanies = (invalidArr) => {
  let companies = []; 
for(i = 0; i < invalidArr.length; i++){
  
  switch (invalidArr[i][0]){
    case 3:
      companies.push('Amex (American Express)');
      break;
    case  4:
      companies.push("Visa");
      break;
    case 5:
      companies.push('Mastercard');
      break;
    case 6:
      companies.push("Discover");
      break;
    default:
      console.log("Company not found");
    }
}
const uniqueSet = new Set(companies);
const convertedArray = [...uniqueSet];
return console.log(convertedArray);
}
//

idInvalidCardCompanies(invalid);