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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]; | |
const valid6 = [4,4,0,0,6,6,5,0,2,4,2,9,4,9,2,6]; | |
// All invalid credit card numbers | |
const invalid1 = [7, 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: | |
let res = [8]; | |
const validateCred = (arr) => { | |
for (let i = arr.length - 2; i >= 0; i--) { | |
if (i % 2 == 0){ | |
let doubled = arr[i] * 2; | |
if (doubled > 9) { | |
doubled -= 9; | |
res.push(doubled); | |
} else { | |
res.push(doubled); | |
} | |
} else { | |
res.push(arr[i]); | |
} | |
} | |
let sum = res.reduce((x, y) => x + y); | |
if (sum % 10 === 0) { | |
return 'valid' | |
} else { | |
return 'invalid'; | |
} | |
} | |
// console.log(validateCred(valid1)); | |
const findInvalidCards = (arr) => { | |
return validateCred(arr); | |
} | |
// console.log(findInvalidCards(invalid1)); | |
const idInvalidCardCompanies = (arr) => { | |
if (arr[0] === 3) { | |
return "Amex (American Express)"; | |
} else if (arr[0] === 4) { | |
return 'Visa' | |
} else if (arr[0] === 5) { | |
return 'Mastercard' | |
} else if (arr[0] === 6) { | |
return 'Discover' | |
} else { | |
return "Company not found" | |
} | |
} | |
console.log(idInvalidCardCompanies(invalid1)) | |
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