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 = [2, 8, 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];

const batch2 = [valid1, valid2, invalid1, invalid2, mystery1, mystery2];


// Add your functions below:
const validateCred = array => {
  let sum = 0;
  let checkNum = 0;
  for(let i = array.length -1; i >= 0 ; i-= 2){
    sum += array[i];
      } 
      for(let i = array.length -2; i >= 0; i-= 2){
        checkNum = (array[i] * 2);
        if(checkNum > 9){
            sum += (checkNum - 9);
          } else sum += checkNum;
      }
      if(sum % 10 === 0){
        return true;
      } else return false;
      
    }

const findInvalidCards = ccNumbers => {
  let validCards = [];
  let invalidCards = [];
    for(let i = 0; i < ccNumbers.length; i++){
      if(validateCred(ccNumbers[i]) === true){
        validCards.push(ccNumbers[i])
      } else invalidCards.push(ccNumbers[i]);
   } //console.log(invalidCards);
   return invalidCards
}

const idInvalidCardCompanies = invalidCards => {
  let cardCompanies = [];
  let firstNums = [];
  for(let i = 0; i < invalidCards.length; i++){
    firstNums.push(invalidCards[i][0]);
    console.log(firstNums);
  }
    for(let i = 0; i < firstNums.length; i++){
      if(firstNums[i] === 3){
        if(cardCompanies.includes('Amex (American Express)')){
          continue
        } else {
          cardCompanies.push('Amex (American Express)');
        }
      }
      else if(firstNums[i] === 4){
        if(cardCompanies.includes('Visa')){
          continue
        } else {
          cardCompanies.push('Visa');
        }
      }
      else if(firstNums[i] === 5){
        if(cardCompanies.includes('Mastercard')){
          continue
        } else {
          cardCompanies.push('Mastercard');
        }
      }
      else if(firstNums[i] === 6){
        if(cardCompanies.includes('Discover')){
          continue
        } else {
          cardCompanies.push('Discover')
        }
      } else console.log(`Company with number ${firstNums[i]} was not found`);
    }
    //console.log(cardCompanies);
    return cardCompanies
  }
  



//console.log(validateCred(batch2));
//findInvalidCards(batch);
console.log(idInvalidCardCompanies(findInvalidCards(batch)));