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:
//Function to convert string of numbers to array of numbers
const convert = str => {
  let numArray = str.split(' ').map(Number);
  return numArray;
}


//To check if card is valid or not
const validateCred = arr => {
  let newArr = []
  if(arr.length % 2 === 0) {
    newArr = arr.map((element, index) => index % 2 === 0 ? element * 2 : element);
  } else {
    newArr = arr.map((element, index) => index % 2 !== 0 ? element * 2 : element);
  }
  newArr = newArr.map(element => element > 9 ? element - 9 : element);
  

  const Sum = newArr.reduce((accumulator, currentValue) => accumulator + currentValue);
 

  if(Sum % 10 === 0) {
    return true;
  } else {
    return false;
  }
}

//To convert invalid card to valid card 
const convertValid = arr => {
  const sum = arr.reduce((acc, curr) => acc + curr);
  const modulo = sum % 10
  if(modulo !== 0) {
     arr.push(modulo);
     return validateCred(arr);
  }
}


//To test validity of credit card from 
//console.log(validateCred(convert('4121412385980902')));

//To find invalid cards in a nested array of cards 
const findInvalid = arr => {
  let invalidCred = [];
  arr.filter(Cards => !validateCred(Cards) ? invalidCred.push(Cards) : Cards);
  return invalidCred;
}

findInvalid(batch);
//To find companies that printed invalid cards 
const findInvalidCardCompanies = arr => {
  let companies = [];
  for(let i = 0; i < arr.length; i++) {
    if(arr[i][0] === 3 && !companies.includes('Amex (American Express)')) {
      companies.push('Amex (American Express)');
    } else if(arr[i][0] === 4 && !companies.includes('Visa')) {
      companies.push('Visa');
    } else if(arr[i][0] === 5 && !companies.includes('Mastercard')) {
      companies.push('Mastercard');
    } else if(arr[i][0] === 6 && !companies.includes('Discover')) {
      companies.push('Discover');
    } else {
      console.log('Company not found');
    }
}
   console.log(companies);
}

findInvalidCardCompanies(findInvalid(batch));