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Created Jan 18, 2022
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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:
const validateCred = arr => {
//Returns TRUE for valid cards and FALSE for invalid cards.
let len = arr.length;
let sum = 0;
for (i = len - 1; i >= 0; i--) {
if ((len - i) % 2 === 0) {
if (arr[i] * 2 > 9) {
sum += arr[i] * 2 - 9;
} else {
sum += arr[i] * 2;
}
} else {
sum += arr[i];
}
}
return sum % 10 === 0;
};
const testAll = arr => {
arr.forEach(element => {
console.log(validateCred(element));
});
};
const findInvalidCards = arr => {
let invArray = [];
arr.forEach(element => {
if (!validateCred(element)) {
invArray.push(element);
}
});
return invArray;
};
const idInvalidCardCompanies = arr => {
let compArray = [];
let compStr = "";
arr.forEach(element => {
switch (element[0]) {
case 3:
compStr = 'Amex (American Express)';
break;
case 4:
compStr = 'Visa';
break;
case 5:
compStr = 'Mastercard';
break;
case 6:
compStr = 'Discover';
break;
default:
compStr = 'Company not found';
break;
}
if (!compArray.includes(compStr)) {
compArray.push(compStr);
}
});
return compArray;
};
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