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, 5, 3, 9, 6, 8, 9, 8, 8, 7, 7, 0, 5, 7, 9, 8];

// 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=>{
  arr.reverse();

 let newA = arr.map(function(number, index) {
    if(index % 2){
      let mul = number * 2;
      if(mul > 9){
        return mul - 9;
      }else{
        return number*2;
      }
    }else{
      return number;
    }
  });

  const reducer = (acc, curr)=> acc + curr;
  let sum = newA.reduce(reducer); 

  return sum % 10 === 0 ? 'valid' : 'invalid'
}
console.log(validateCred(mystery2));

const findInvalidCards = nestedarr =>{
  let invalidCards=[];
  nestedarr.forEach(arr=>{
    return validateCred(arr) === 'invalid' ? invalidCards.push(arr) : 'valid'
  })
  return invalidCards;
}
console.log(findInvalidCards(batch));

const idInvalidCardCompanies = nestedarr=>{
  let companies = [];
  let joh = nestedarr.forEach(arr=>{
    if(arr[0] === 3){
      companies.push('AMEX (American Express)');
    }else if(arr[0] === 4){
      companies.push('Visa');
    }else if(arr[0] === 5){
      companies.push('Mastercard');
    }else if(arr[0] === 6){
      companies.push('Discover');
    }else{
      console.log('company not found');
    }
  })
  let newCompanies = [...new Set(companies)];
  return newCompanies
  return joh;
}
console.log(idInvalidCardCompanies(batch));