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Created July 1, 2020 20:20
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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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