Skip to content

Instantly share code, notes, and snippets.

@codecademydev
Created Oct 3, 2021
Embed
What would you like to do?
Codecademy export
// 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) => {
cloneArr = [...arr];
cloneArr.reverse();
let result = [];
cloneArr.forEach((elem, idx) => {
if(idx % 2 === 0){
result.push(elem);
} else {
if((elem * 2) > 9){
result.push(elem * 2 - 9)
} else (
result.push(elem * 2)
)
}
})
let total = result.reduce((acu, cur) => acu + cur);
if(total % 10 === 0){
return true;
} else {
return false;
}
}
const findInvalidCards = (arr) => {
let invalid = [];
arr.forEach(elem => {
if(!validateCred(elem)){
invalid.push(elem);
}
})
return invalid;
}
const idInvalidCardCompanies = (arr) => {
let firstDigit = [];
let names = [];
arr.forEach(elem => {firstDigit.push(elem[0])});
if(firstDigit.includes(3)){
names.push('Amex (American Express)');
}
if(firstDigit.includes(4)){
names.push('Visa');
}
if(firstDigit.includes(5)){
names.push('Mastercard');
}
if(firstDigit.includes(6)){
names.push('Discover');
}
if(names.length !== 0){
return(names);
} else {
console.log('Company not found');
}
}
@Alexthh93

This comment has been minimized.

Copy link

@Alexthh93 Alexthh93 commented Oct 5, 2021

DId you remember to remember the doubles from the push of idInvalidCardCompanies?

Beside that... Well done!!!

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment