My credit card checker

bit2736304594 · March 19, 2021, 4:38pm

gist.github.com

https://gist.github.com/codecademydev/0df4b54c20b7f606e00940e5cd86e15e

main.js

// 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];

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midlindner · March 19, 2021, 6:21pm

Hello, @bit2736304594, and welcome to the forums.

I ran your code. It returns valid3 as invalid.
It also returns mystery3 as valid, but it is an invalid number.

Hint:

Your code always starts at the beginning of the card number array, and doubles every other digit. The problem occurs when a card number has an odd number of digits.

bit2736304594 · March 29, 2021, 8:54pm

Thank you!!! I saw were I went wrong.