const luhnCheck = (num: string): boolean => { let arr = (num + '').split('').reverse().map(x => parseInt(x)); let lastDigit = arr.splice(0, 1)[0]; let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9), 0); return (sum + lastDigit) % 10 === 0; };

How to Use

This luhn algorithm (credit card) validator can be used in your project by following these simple steps:

Select your preferred programming language from the code block above
Click the "Copy" button to copy the code to your clipboard
Paste the code into your project file
Customize the parameters as needed for your specific use case
Test the validator with sample inputs before deploying to production

About This Validator

The luhn algorithm (credit card) is a common validation requirement in modern software development. This implementation follows industry best practices and is optimized for both performance and accuracy. The code is MIT licensed and free to use in personal and commercial projects.

Available in multiple programming languages including TypeScript, JavaScript, Python, Go, and PHP, this validator can be integrated into virtually any tech stack. Each implementation maintains consistent logic and behavior across languages.

Luhn Algorithm (Credit Card)