Luhn's algorithm, also known as mod 10 algorithm is a simple checksum algorithm used widely for validating identification numbers, such as credit card numbers. Check out Wikipedia article for more information. 💰💳
The main goal for this project was to simply play with the N-API addon capability, implement some algorithm in C++ and use it in node.js application. 👨💻
Also, ...just for fun! 🤷♂️
💡 If you notice some bad practices or you have any comments, please feel free to contact me.
You can check if provided number (actually a string 🤫) is "valid" according to the Luhn's algorithm.
const luhn = require("luhnjs");
const isValid = luhn.isValid("123");
console.log(isValid);You can also generate a checkDigit. Let's take an example from Wikipedia: Assume an example of an account number "7992739871" that will have a check digit added, making it of the form "7992739871x.
The way it works is that you should provide the 7992739871 number and the
algorithm will compute the x digit.
const luhn = require("luhnjs");
const checkDigit = luhn.generateCheckDigit("7992739871");
console.log(checkDigit);Please find scripts in package.json:
npm run build- This command will build the C++ project.npm run clean
If you want to find out how to run the C++ unit tests please read this.