Create a function validCard to validate a Credit Card number with the Luhn Alogrithm implemented in React.js

1. Take the last to second digit in a series (credit card number)
2. Double the digit and every other digit until reaching the end (or the beginning of the sequence)
3. Add all digits in modified number
4. If total is divisible by 10, it is valid otherwise it is invalid

• JSX, Sass
• React.js