Hi, everyone! Hope I completed the project, compared with https://discuss.codecademy.com/t/credit-card-checker-challenge-project-javascript/462375?u=artashes85, and corrected some errors, but there are little different results, please review if there are errors. Thanks!
// 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) => {
//
// console.log(arr);
//
let sum = 0;
for(let i = arr.length - 1; i >= 0; i--) {
//
// console.log(arr[i]);
//
let currNumber = arr[i];
if (i%2 === 0) {
currNumber *= 2;
//
// console.log(arr[i]);
// console.log(currNumber)
// break;
//
if(currNumber > 9) {
currNumber -= 9;
}
}
// console.log(currNumber)
sum += currNumber;
}
// console.log(sum);
if(sum % 10 === 0) {
return true
} else {
return false
}
}
// validateCred(valid1);
// Test functions:
console.log(validateCred(valid1)); // Should print true
console.log(validateCred(invalid1)); // Should print false
const findInvalidCards = cardNumbers => {
const invalid = [];
for (let i = 0; i < cardNumbers.length; i++) {
let currCred = cardNumbers[i];
if (!validateCred(currCred)) {
invalid.push(currCred);
}
}
return invalid;
}
// Test function
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)); // Test what the mystery numbers are
const idInvalidCardCompanies = (invalidBatch) => {
const companies = [];
for(let i = 0; i < invalidBatch.length; i++) {
switch(invalidBatch[i][0]) {
case 3:
if (companies.indexOf('Amex') === -1) {
companies.push('Amex');
}
break;
case 4:
if (companies.indexOf('Visa') === -1) {
companies.push('Visa');
}
break;
case 5:
if (companies.indexOf('Mastercard') === -1) {
companies.push('Mastercard');
}
break;
case 6:
if (companies.indexOf('Discover') === -1) {
companies.push('Discover');
}
break;
default:
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