How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)

How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)

Greetings, today I shall be showing you how to use the Luhn algorithm to validate a credit card number or debit card, using Kotlin.

The Luhn algorithm is a simple checksum formula used to validate the integrity of identification numbers such as credit card numbers.
The Luhn algorithm works by performing the following steps:
Double every other digit in the number, starting with the second-to-last digit and moving left.

If a doubled number is greater than 9, you mod the number by 10 and add 1 onto the remainder.

We then add up all the digits.

We then mod the total by 10. If the sum is a multiple of 10, we return true as it is a valid credit card, if not then false as the credit card is invalid.

Thanks for watching this Kotlin credit card number validation tutorial.

How to Validate a Credit Card Number in Kotlin (Luhn Algorithm)