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];

function validateCred(array){
var modified = array.slice(0).reverse()
// console.log(modified)
  for(let i = 1; i < modified.length; i+=2){
    if(modified[i] * 2 > 9){
         modified[i] = modified[i] * 2 - 9
        } else {
          modified[i] *=2
        }  
}
let finalModified = modified 
// console.log(finalModified)
let addition = finalModified.reduce(function(acc, curr){ return acc + curr})
// console.log(addition)
return addition % 10 == 0
}

console.log(validateCred(valid1))
console.log(validateCred(invalid1))
console.log(validateCred(mystery1))
console.log(validateCred(mystery2))
console.log(validateCred(mystery3))
console.log(validateCred(mystery4))
console.log(validateCred(mystery5))

function findInvalidCards(cards){
  let inValidNumbers = [] 
  for(let j = 0; j < cards.length; j++){
     if(!validateCred(cards[j])) {
      inValidNumbers.push(cards[j])    
  } 
}
  return inValidNumbers
}

console.log(findInvalidCards([valid1, valid2, valid3, valid4, valid5]));// Shouldn't print anything
console.log(findInvalidCards([invalid1, invalid2, invalid3, invalid4, invalid5])); // Should print all of the numbers
console.log(findInvalidCards(batch))

function idInvalidCardCompanies(invalidset){

const companies = []

for(let k = 0; k < invalidset.length; k++){
  
  if(invalidset[k][0] == 3 && companies.indexOf('Amex') == -1){
     companies.push('Amex')
  } 
  
  else if(invalidset[k][0] == 4 && companies.indexOf('Visa') == -1){
    companies.push('Visa')
  } 

  else if(invalidset[k][0] == 5 && companies.indexOf('Mastercard') == -1){
    companies.push('Mastercard')
  } 

  else if(invalidset[k][0] == 6 && companies.indexOf('Discover') == -1){
    companies.push('Discover')
  } 

  else{
    console.log('Company not found')
  }

 } 

    return companies

}

console.log(idInvalidCardCompanies([invalid1])); // Should print['visa']
console.log(idInvalidCardCompanies([invalid2])); // Should print ['mastercard']
console.log(idInvalidCardCompanies(batch)); // Find out which companies have mailed out invalid cards