I’m not sure if this is the right way to share as I’m new at this. But here goes:
/ 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) =>{
reverseArr = ;
//reverse array to iterate from “right to left”
for(let i = arr.length - 1; i >= 0; i–){
reverseArr.push(arr[i]);
}
//every 2nd item * 2 // > 9 = item - 9
for(let j = 0; j < reverseArr.length; j++){
if(j % 2 !== 0){
reverseArr[j] = reverseArr[j] * 2;
if(reverseArr[j] > 9){
reverseArr[j] = reverseArr[j] - 9;
}
}
}
let cardConfirm = reverseArr.reduce((previousValue, currentValue) =>previousValue + currentValue)
if(cardConfirm % 10 === 0){
return true;
}else{
return false;
}
//return reverseArr;
};
//console.log(validateCred(valid3));
const findInvalidCards = (batchArr) =>{
let invalidCards =
for(let item = 0; item < batchArr.length; item++){
//console.log(item);
//console.log(batchArr[item]);
if(validateCred(batchArr[item])){
continue
}else{
invalidCards.push(batchArr[item]);
};
}
return invalidCards;
};
//console.log(findInvalidCards(batch));
const idInvalidCardCompanies = (arr) =>{
let invalidcards = findInvalidCards(arr);
let invalidCompany = ;
let filteredCompany = ;
let company;
for(let i = 0; i < invalidcards.length; i++){
switch(invalidcards[i][0]) {
case 3:
company = ‘Amex (American Express)’;
if(invalidCompany.indexOf(company) === -1) {
invalidCompany.push(company);
};
break;
case 4:
company = ‘Visa’;
if(invalidCompany.indexOf(company) === -1) {
invalidCompany.push(company);
};
break;
case 5:
company = ‘Mastercard’;
if(invalidCompany.indexOf(company) === -1) {
invalidCompany.push(company);
};
break;
case 6:
company = ‘Discover’
if(invalidCompany.indexOf(company) === -1) {
invalidCompany.push(company);
};
break
default:
company = ‘Unknown Company’
if(invalidCompany.indexOf(company) === -1) {
invalidCompany.push(company);
};
}
}
return(invalidCompany);
}
console.log(idInvalidCardCompanies(batch));