Created
April 2, 2018 13:14
-
-
Save alexpvieira/f05401e027dbcc9b10fb0d6a981583dd to your computer and use it in GitHub Desktop.
Validate Credit Card
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
export default function validateCard(card) { | |
if (/[^0-9-\s]+/.test(card)) return false | |
var nCheck = 0, nDigit = 0, bEven = false | |
card = card.replace(/\D/g, "") | |
for (var n = card.length - 1; n >= 0; n--) { | |
var cDigit = card.charAt(n), | |
nDigit = parseInt(cDigit, 10) | |
if (bEven) { | |
if ((nDigit *= 2) > 9) nDigit -= 9 | |
} | |
nCheck += nDigit | |
bEven = !bEven | |
} | |
return (nCheck % 10) == 0 | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment