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const validateCardNumber = (number) => {
	var regex = new RegExp("^[0-9]{16}$");
	if (!regex.test(number)) { return false; }

	return luhnCheck(number);
}

const luhnCheck = (val) => {
	var sum = 0;
	for (var i = 0; i < val.length; i++) {

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import csv

import firebase_admin
import google.cloud
from firebase_admin import credentials, firestore

cred = credentials.Certificate("./ServiceAccountKey.json")
app = firebase_admin.initialize_app(cred)

store = firestore.client()

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export const UseState = () => {
	//Declare state value of count and setCount function to update
	//set the initial value of count as 0
	const [count, setCount] = useState(0);

	//setCount function 
	return (
		<div className='content'>
			<h4>UseState</h4>
			<p>You clicked {count} times</p>

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import firebase_admin
from firebase_admin import credentials, firestore

cred = credentials.Certificate("./ServiceAccountKey.json")
app = firebase_admin.initialize_app(cred)

store = firestore.client()
doc_ref = store.collection(u'COLLECTION_TO_CHECK')

data = []

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import csv
import firebase_admin
import google.cloud
from firebase_admin import credentials, firestore

cred = credentials.Certificate("./ServiceAccountKey.json")
app = firebase_admin.initialize_app(cred)

store = firestore.client()

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import firebase_admin
import google.cloud
from firebase_admin import credentials, firestore

cred = credentials.Certificate("./ServiceAccountKey.json")
app = firebase_admin.initialize_app(cred)

store = firestore.client()

doc_ref = store.collection(u'test')

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import firebase_admin
import google.cloud
from firebase_admin import credentials, firestore

cred = credentials.Certificate("./ServiceAccountKey.json")
app = firebase_admin.initialize_app(cred)

store = firestore.client()
doc_ref = store.collection(u'users').limit(2)

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pip install firebase-admin google-cloud-firestore

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virtualenv env

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import React, { useState, useEffect } from 'react';

function Example() {
	// Declare a new state variable, which we'll call "count"
	const [count, setCount] = useState(0);

	useEffect(() => {
		// Update the document title using the browser API
		document.title = `You have written ${count} hooks`;
	});