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Credit Card Checker - needs to be advised
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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: | |
function validateCred(array) { | |
const revArr = array.reverse(); | |
let sumDoubled = 0; | |
let sumRest = 0; | |
for (let i = 0; i < revArr.length; i++) { | |
if (i !== 0 && i % 2 !== 0) { | |
// iterate thru reversed | |
let doubledDigits = []; | |
doubledDigits = revArr[i] * 2 | |
// doubled every other digits | |
for (let j = 0; j < doubledDigits.length; j++){ | |
return doubledDigits[j]; | |
if (doubledDigits[j] > 9) { | |
return doubledDigits[j] -= 9 | |
sumDoubled += doubledDigits[j]; | |
} // subtracted 9 from doubled | |
} // end of iterator | |
} else if (i % 2 === 0) { | |
sumRest += revArr[i] | |
// sum of rest digits | |
} // end of if + else if | |
} // end of first iterator | |
const totalSum = sumDoubled + sumRest; | |
return (totalSum % 10 === 0 ? true : false); | |
}; // end of validateCred | |
function findInvalidCards(array) { | |
let listOfInvalid = []; | |
if (validateCred(array) === false) { | |
listOfInvalid.push(validateCred(array)); | |
return listOfInvalid; | |
} // list of invalid cards; | |
console.log('Your credit card number is invalid.') | |
}; | |
function idInvalidCardCompanies(array) { | |
let companyList = []; | |
if (validateCred(array) === false) { | |
const firstDigit = array[0]; | |
switch(firstDigit){ | |
case 3: | |
if (companyList.indexOf('Amex') === undefined){ | |
companyList.push('Amex'); | |
} | |
break; | |
case 4: | |
if (companyList.indexOf('Visa') === undefined) { | |
companyList.push('Visa'); | |
} | |
break; | |
case 5: | |
if (companyList.indexOf('Mastercard') === undefined) { | |
companyList.push('Mastercard'); | |
} | |
break; | |
case 6: | |
if (companyList.indexOf('Discover') === undefined) { | |
companyList.push('Discover'); | |
} | |
break; | |
default: | |
console.log('Company not found'); | |
} // end of switch | |
} // end of if | |
console.log(companyList); | |
}; | |
const numBatch = batch.length - 1; | |
let random = Math.floor(Math.random() * numBatch); | |
const cardNum = batch[random].join('') | |
function checkerTester() { | |
console.log(`Your credit card number is: ${cardNum}`) | |
if (validateCred(batch[random]) === true){ | |
console.log('Your credit card number is valid.') | |
} else { | |
findInvalidCards(batch[random]); | |
idInvalidCardCompanies(batch[random]); | |
}; | |
} | |
checkerTester(random) | |
// |
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