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Created February 12, 2021 15:39
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// 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];
const validateCred = arr => {
let checkSum = 0;
let doubling = true;
//Iterate through array, double what is needed
for(let i = arr.length - 2; i >= 0; i--){
if(doubling){
let doubled = arr[i] * 2;
if(doubled > 9){
doubled -= 9;
}
checkSum += doubled;
} else {
checkSum += arr[i];
}
doubling = !doubling;
}//End for loop
const totalSum = checkSum + arr[arr.length - 1];
if(totalSum % 10 === 0){
return true;
} else {
return false;
}
};
const findInvalidCards = arr => {
const invCrds = batch.filter(arr => validateCred(arr));
return invCrds;
};
const idInvalidCardCompanies = arr => {
const invCompanies = [];
arr.forEach(array => {
switch(array[0]) {
case 3:
if(!invCompanies.includes('Amex (American Express)')){
invCompanies.push('Amex (American Express)');
};
break;
case 4:
if(!invCompanies.includes('Visa')){
invCompanies.push('Visa');
};
break;
case 5:
if(!invCompanies.includes('Mastercard')){
invCompanies.push('Mastercard');
};
break;
case 6:
if(!invCompanies.includes('Discover')){
invCompanies.push('Discover');
};
break;
default:
console.log('Company not found');
break;
}
});
return invCompanies;
};
//console.log(validateCred(valid2));
//batch.forEach(validateCred);
//console.log(findInvalidCards(batch));
console.log(idInvalidCardCompanies(findInvalidCards(batch)));
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