Hey guys, I’m attempting to work my way through the credit card checker project here, and I’m a little bit stumped.
I was able to get the first function, validateCred working, i think.
I think I have a nesting error somewhere in my second function, because when I call it on the provided batch variable, I get a TypeError: cannot read property ‘slice’ of undefined…
code below:
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 = card => {
const reversed = card.slice().reverse();
for(let i = 0; i < reversed.length; i++) {
if(i % 2 != 0) {
reversed[i] = 2 * (reversed[i]);
if(reversed[i] > 9) {
reversed[i] -= 9;
}
}
}
let cardSum = reversed.reduce((a, b) => a + b, 0);
if(cardSum % 10 == 0) {
return true;
} else {
return false;
}
};
const findInvalidCards = array => {
let invalidCards = [];
for(let i = 0; i <= array.length; i++){
if(!validateCred(array[i])) {
invalidCards.push(array[i]);
}
}
};
const idInvalidCardCompanies = array => {
let invalidArray = [];
let firstDigitArray = [];
for(let i = 0; i < array.length; i++) {
firstDigitArray.push(array[i][0]);
}
for(let n = 0; n < firstDigitArray.length; n++) {
const x = firstDigitArray[n];
switch (x) {
case '3': invalidArray.push('Amex (American Express)');
break;
case '4': invalidArray.push('Visa');
break;
case '5': invalidArray.push('Mastercard');
break;
case '6': invalidArray.push('Discover');
break;
default: invalidArray.push('Company Not Found');
}
}
/* Before this function finishes, I need to filter the array so that duplicate entries are removed */
};```
