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:
const validateCred = (arr) => {
  const newArr = arr.slice(0);
  //console.log(newArr)
  for (let i = 0; i < newArr.length; i += 2){
    newArr[i] *= 2;
  }
  for (let j = 0; j < newArr.length; j++){
    if (newArr[j] > 9){
      newArr[j] -= 9;
    }
  }
    //console.log(newArr)
   let sum = newArr.reduce((a, b) => a + b, 0);
     //console.log(sum)
   if (sum % 10 == 0){
     return 'valid';
   } else {
     return 'invalid';
   }
 }

const findInvalidCards = (arr) => {
  let invalidCards = [];
  for (let k = 0; k < arr.length; k++){
    if (validateCred(arr[k]) === 'invalid'){
      invalidCards.push(arr[k])
    }
   } return invalidCards;
  }

//console.log(findInvalidCards(batch))
const idInvalidCardCompanies = (arr) => {
  let companies = [];
  for (let l = 0; l < arr.length; l++){
    let firstDigit = arr[l][0];
    switch (firstDigit) {
      case 3: companies.push('Amex');
      break;
      case 4: companies.push('Visa');
      break;
      case 5: companies.push('Mastercard');
      break;
      case 6: companies.push('Discover');
      break;
      default: companies.push('Company not found');
    }
  } return companies.filter((a,b) => companies.indexOf(a) === b)
}
//console.log(idInvalidCardCompanies(findInvalidCards(batch)))