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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]; | |
// Add your functions below: | |
const validateCred = inputArray => { | |
let sum = 0; | |
for (let firstIndex = inputArray.length - 2; firstIndex >= 0; firstIndex -= 2) { | |
let addToSum = inputArray[firstIndex] * 2; | |
sum += addToSum > 9 ? addToSum - 9 : addToSum; | |
} | |
for (let secondIndex = inputArray.length - 1; secondIndex >= 0; secondIndex -= 2) { | |
sum += inputArray[secondIndex]; | |
} | |
return sum % 10 === 0; | |
}; | |
const findValidCards = input => validCards = input.filter(subArray => validateCred(subArray)); | |
const findInvalidCards = input => invalidCards = input.filter(subArray => !validateCred(subArray)); | |
console.log(validateCred(valid4)); | |
console.log('Valid Details:', findValidCards(batch), '\rInvalid Details:', findInvalidCards(batch)); | |
const idInvalidCardCompanies = fullDataSet => { | |
const companiesWithInvalidDetails = []; | |
const companies = { | |
3: 'Amex (American Express)', | |
4: 'Visa', | |
5: 'Mastercard', | |
6: 'Discover' | |
}; | |
for (invalidDetails of fullDataSet) { | |
if (companies[invalidDetails[0]]){ | |
companiesWithInvalidDetails.push(companies[invalidDetails[0]]); | |
} else { | |
companiesWithInvalidDetails.push('Company not found'); | |
} | |
} | |
return [...new Set(companiesWithInvalidDetails)]; | |
} | |
console.log(idInvalidCardCompanies(findInvalidCards(batch))); | |
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