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 validateCred (array){
 const numbX2 = [];
 const numbDiff = [];
 const numbRemaining =[];
 
  for (let i = array.length-2 ; i > -1 ; i-=2 ){
    numbX2.push(array[i] * 2)
   }
   for (let i = array.length-1 ; i >= 0 ; i-=2 ){
    numbRemaining.push(array[i])
   }
  // console.log(numbRemaining)   numeri rimasti fuori dalla moltiplicazione
   for(const digit of numbX2){
    
     if(digit > 9){
        numbDiff.push(digit-9)
     }else{
       numbDiff.push(digit)
     }
   }
  // console.log(numbDiff)    numeri superiori a 9 dove è stato sosttratto il valore di 9 come da algoritmo di luhn

let tot1 = numbDiff.reduce((numb1,numb2) => numb1+numb2 )
 
let tot2 = numbRemaining.reduce((numb1,numb2) => numb1+numb2 )
 
 
const sumTotal = tot1+tot2

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

}

//console.log(validateCred(mystery3))

const findInvalidCards = (arrAnn) => {
  const arrInvalidCards = [];
  for(let i = 0; i < arrAnn.length; i++){
    if(validateCred(arrAnn[i]) === false){
        
           arrInvalidCards.push(arrAnn[i])
      }
    
  }
  return arrInvalidCards
}

const cardInvalid = findInvalidCards(batch)
//console.log(findInvalidCards(batch))

const idInvalidCardCompanies = (invalidCards) =>{
  const CompaniesInvalidCards = [];
  for(let i = 0; i < invalidCards.length ; i++){
  
    switch (invalidCards[i][0]){
      case 3 : 
       if(CompaniesInvalidCards.indexOf('Amex') === -1){ 
       CompaniesInvalidCards.push('Amex')
       }    
       break;
       case 4 : 
       if(CompaniesInvalidCards.indexOf('Visa') === -1){             
       CompaniesInvalidCards.push('Visa')
       }
       break;
       case 5 : 
       if(CompaniesInvalidCards.indexOf('Mastercard') === -1){ 
       CompaniesInvalidCards.push('Mastercard')
       }
       break;
       case 6 : 
       if(CompaniesInvalidCards.indexOf('Discover') === -1){ 
       CompaniesInvalidCards.push('Discover')
       }
       break;
      default:  `Company not found`
      break;
    }
    
  }
  return CompaniesInvalidCards
}

console.log(idInvalidCardCompanies(cardInvalid))