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Created November 3, 2021 07:49
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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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