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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: | |
// --------------------------------------- | |
// return card's condition (valid/invalid) | |
function validateCred(array) { | |
let momentSum = 0; | |
let condition; | |
if (array.length % 2 === 0) { | |
for (i = array.length-1; i >= 0; i -= 2) { | |
let localSum = 0; | |
let doubled = 2 * array[i-1]; | |
if (doubled < 9) { | |
localSum = array[i] + doubled; | |
momentSum += localSum; | |
} else { | |
let reduced = doubled - 9; | |
localSum = array[i] + reduced; | |
momentSum += localSum; | |
} | |
} | |
if (momentSum % 10 === 0) { | |
condition = 'valid number'; | |
return condition; | |
} else { | |
condition = 'invalid number'; | |
return condition; | |
} | |
} else if (array.length % 2 !== 0) { | |
let number = array.pop(); | |
for (let i = array.length-1; i >=0; i-=2) { | |
let localSum = 0; | |
let doubled = 2 * array[i]; | |
if (doubled < 9) { | |
localSum = doubled + array[i-1]; | |
momentSum += localSum; | |
} else { | |
let reduced = doubled - 9; | |
localSum = reduced + array[i-1]; | |
momentSum += localSum; | |
} | |
} | |
momentSum += number; | |
if (momentSum % 10 === 0) { | |
condition = 'valid number'; | |
return condition; | |
} else { | |
condition = 'invalid number'; | |
return condition; | |
} | |
} | |
}; | |
// console.log(validateCred(mystery5)); | |
// console.log('\n'); | |
// --------------------------------------- | |
// return array of invalid cards | |
function findInvalidCards(arrayGroup) { | |
let validCardArray = []; | |
let invalidCardArray = []; | |
for (let j = 0; j < arrayGroup.length; j++) { | |
if (validateCred(arrayGroup[j]) === 'valid number') { | |
validCardArray.push((arrayGroup[j])); | |
} else { | |
invalidCardArray.push(arrayGroup[j]); | |
} | |
} | |
return invalidCardArray; | |
}; | |
let invalidCards = findInvalidCards(batch); | |
// console.log(invalidCards); | |
// console.log('\n'); | |
// --------------------------------------- | |
//return array of identified companies | |
function idInvalidCardCompanies(array) { | |
let companiesArray = []; | |
array.forEach(numArray => { | |
let company = ''; | |
if (numArray[0] === 3) { | |
company = 'American Express'; | |
} else if (numArray[0] === 4) { | |
company = 'Visa'; | |
} else if (numArray[0] === 5) { | |
company = 'MasterCard'; | |
} else if (numArray[0] === 6) { | |
company = 'Discover'; | |
} else { | |
console.log('Company not Found') | |
} | |
if (company) { | |
companiesArray.push(company); | |
} | |
}) | |
companiesArray = companiesArray.filter((value, i, array) => array.indexOf(value) === i); | |
return companiesArray; | |
}; | |
let invalidCompanies = idInvalidCardCompanies(invalidCards); | |
// console.log(invalidCompanies); |
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