Credit Card Checker Challenge Project (JavaScript)

creditCardValidator.js

// Codecademy Credit Card Number exercise by Eduardo Aire Torres

// 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 validateCred(array) {

  const revArr = array.reverse();
  let validationArray = [];

  let counter = 0;
  for (const digit of revArr) {
    if (digit < 10 && digit >= 0) {

      if (counter % 2 !== 0) {
        if (digit * 2 >= 10) {
          validationArray.push(digit * 2 - 9);
        } else {
          validationArray.push(digit * 2);
        }
      } else {
        validationArray.push(digit);
      }

    } else {
      console.log('Every digit must be above, equal to 0 or bellow 10');
    }
    counter += 1
  }

  //console.log(validationArray);
  const reducer = (accumulator, currentValue) => accumulator + currentValue;
  validationArray = validationArray.reduce(reducer);

  let company;
  if (array[0] === 3) {
    company = 'Amex';
  } else if (array[0] === 4) {
    company = 'Visa';
  } else if (array[0] === 5) {
    company = 'Mastercard';
  } else if (array[0] === 6) {
    company = 'Discover';
  } else {
    company = 'Not Found';
  }

  if (validationArray % 10 === 0) {
    console.log(`Valid ${company}`);
  } else {
    console.log('Invalid');
  }

}

for (const card of batch) {
  validateCred(card);
}