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main.js
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main.js
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/*
Antonio Keyes
7-24-21
*/
// 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]
/*
1. double the num immediately before checkNum (right most num), skipping every other num to the left until reaching beginning of arr
2. if doubled numbers are 2 digit numbers, add individual digits
*** if doubledNum > 9, return (doubledNum - 9) *** much easier this way
3. add every number = totalSum
5. if (totalSum % 10 == 0) return true (valid CC), else false (invalid CC)
*/
const validateCred = array => {
let doubledNums = [];
let unchangedNums = [];
for (let i = array.length - 2; i >= 0; i -= 2) {
let doubledNum = array[i] * 2;
if (doubledNum > 9) {
doubledNum -= 9;
}
doubledNums.push(doubledNum);
}
for (let i = array.length - 1; i >= 0; i -=2) {
unchangedNums.push(array[i]);
}
let completeArray = doubledNums.concat(unchangedNums);
let totalSum = completeArray.reduce((a, b) => a + b);
if (totalSum % 10 == 0) {
return true;
} else {
return false;
}
}
const findInvalidCards = arrayOfCards => {
let invalidCards = []
//iterate through each card in the batch, plug into validateCred function
//if its an invalid card, add it to the invalidCards array
for (let card of arrayOfCards) {
if (validateCred(card) == false) {
invalidCards.push(card);
}
}
return invalidCards;
}
const idIndividualCardCompanies = invalidCards => {
//return array of companies
let companiesThatMessedUp = [];
//create companies object to compare against
const companies = {
3: 'Amex',
4: 'Visa',
5: 'Mastercard',
6: 'Discover'
}
// loop through both the invalid cards and the companies in the companies object
// if there is a match, add to companiesThatMessedUp
for (let number of invalidCards) {
for (let [key, value] of Object.entries(companies)) {
if (number[0] == key) {
companiesThatMessedUp.push(value);
}
}
}
// delete duplicates
let uniqueCompanies = companiesThatMessedUp.filter((company, index) => {
return companiesThatMessedUp.indexOf(company) === index;
})
return uniqueCompanies;
}
//create a variable to be passed to the idIndividualCardCompanies function
invalidCards = findInvalidCards(batch);
console.log(findInvalidCards(batch));
console.log(idIndividualCardCompanies(invalidCards));