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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]; | |
const invalid6 = [8, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4]; | |
const invalid7 = [9, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4]; | |
const invalid8 = [1, 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, invalid6, invalid7, invalid8, mystery1, mystery2, mystery3, mystery4, mystery5]; | |
// Add your functions below: | |
const validateCred = array => { | |
//to store the elements to be added | |
let sumArray = []; | |
array.reverse(); | |
sumArray.push(array[0]); | |
for (let i=1; i<array.length; i++){ | |
if(i%2===0){ | |
sumArray.push(array[i]); | |
} | |
//every odd digit | |
if(i%2 !== 0){ | |
let tempDouble = array[i]*2; | |
if(tempDouble>9){ | |
tempDouble -= 9; | |
} | |
sumArray.push(tempDouble); | |
} | |
} | |
//returning the array back to the original state | |
array.reverse(); | |
//summing the elements in sumArray | |
let sum = sumArray.reduce((prev, current)=>prev+current); | |
if(sum%10===0){ | |
return 'valid' | |
} | |
return 'invalid' | |
} | |
// console.log(validateCred(invalid1)) | |
const findInvalidCards = arrays => { | |
let invalidCards = []; | |
for (let i=0; i<arrays.length; i++){ | |
let checkValid = validateCred(arrays[i]); | |
if(checkValid === 'invalid'){ | |
invalidCards.push(arrays[i]) | |
} | |
} | |
return invalidCards; | |
} | |
const idInvalidCardCompanies = arrays => { | |
const companies = { | |
3 : 'amex', | |
4 : 'visa', | |
5 : 'mastercard', | |
6 : 'discover' | |
} | |
// let example = Object.keys(companies) | |
// console.log(example) | |
let companyArray = []; | |
//return the first digit of the card number | |
arrays.forEach(element => { | |
if (element[0] < 3 || element[0] > 6){ | |
console.log(`Digit starting with ${element[0]} : Company not found`) | |
} | |
// console.log(element[0]); | |
for (let key in companies){ | |
if(element[0] == key){ | |
companyArray.push(companies[key]) | |
} | |
} | |
}) | |
let nonDuplicate = companyArray.filter((c, index)=>{ | |
return companyArray.indexOf(c) === index; | |
}) | |
return nonDuplicate; | |
} | |
//test functions | |
// console.log(validateCred(valid1)) | |
// console.log(validateCred(invalid1)) | |
// console.log(findInvalidCards([valid1, valid2, invalid1])) | |
// console.log(idInvalidCardCompanies(findInvalidCards(batch))) |
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