The identifyFlagCard function is used to identify the credit card flag based on the first digits of the card number. It returns the name of the card flag as a string.
The function can be imported using ES6 syntax from the "multiform-validator" package:
import { identifyFlagCard } from 'multiform-validator';Alternatively, you can import the function using CommonJS syntax with require (Node.js):
const { identifyFlagCard } = require('multiform-validator');The function takes one parameter:
cardNumber (string) - The credit card number for which to identify the flag based on the first digits.// Example 1 - Identifying the card flag based on the first digits
const result = identifyFlagCard('6062 8226 8644 9791');
console.log(result); // Output: "Discover"The function expects the credit card number to be passed as a string. It uses the first digits of the card number to identify the card flag and returns the corresponding flag name as a string. If the card flag cannot be identified or the input is not a string, it returns 'Unknown'.