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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 = arr => { | |
const checkDigit = arr[arr.length - 1] | |
let payload = arr.slice(0, arr.length - 1) | |
//console.log(payload) | |
for (let i = payload.length - 1; i >= 0; i -= 2) { | |
payload[i] *= 2; | |
if (payload[i] > 9) { | |
payload[i] -= 9 | |
} | |
} | |
const reducedPayload = payload.reduce((a, b) => a + b) + checkDigit | |
if (reducedPayload % 10 === 0) { | |
return true | |
} else { | |
return false | |
} | |
} | |
const findInvalidCards = arr => { | |
let invalidCards = arr.filter(nestedArr => validateCred(nestedArr) === false) | |
return invalidCards | |
} | |
const idInvalidCardCompanies = arr => { | |
let companies = [] | |
arr.forEach(nestedArr => { | |
//console.log(nestedArr[0]) | |
if (nestedArr[0] === 3) { | |
if (!companies.includes('Amex (American Express)')){ | |
companies.push('Amex (American Express)') | |
} | |
} else if (nestedArr[0] === 4) { | |
if (!companies.includes('Visa')) { | |
companies.push('Visa') | |
} | |
} else if (nestedArr[0] === 5) { | |
if (!companies.includes('Mastercard')) { | |
companies.push('Mastercard') | |
} | |
} else if (nestedArr[0] === 6) { | |
if (!companies.includes('Discover')) { | |
companies.push('Discover') | |
} | |
} else { | |
companies.push('Company not found') | |
} | |
}) | |
return companies | |
} | |
console.log(idInvalidCardCompanies(findInvalidCards(batch))); | |
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