lejonmanen

import { getQuestion } from './readline.js'

const [question, close] = getQuestion()

let input = await question('Please input a number')
console.log(`The number is: ${input}.`)

close()

lejonmanen

import { createContext, useState, useContext } from 'react'


// Create the context in a separate file. Import it to every component that needs it.
const CounterContext = createContext(0)


const ContextDemo = () => {
	const [count, setCount] = useState(2)
	const contextValue = { count, setCount }

lejonmanen

import { useRef } from 'react'

const MediaDevice = () => {
	const videoRef = useRef(null)

	const handleVideoOn = () => assignStream(videoRef.current)
	const handleVideoOff = () => videoRef.current.srcObject = null

	return (
		<div>

lejonmanen

import { useEffect, useRef } from 'react'

/*
Safely send and cancel one AJAX request at the time. If you need to send multiple requests at the same time, call this hook several times.

Usage:
const [cancelRef, doAjax] = useCancellableAjax()

Fetch data. Tip: use a setState function as callback.
doAjax(url, fetchOptions, dataCallback)

lejonmanen

// Copy and paste this code into your main script file
// The purpose is to register the service worker
// The browser will load sw.js for us if you do this

if ('serviceWorker' in navigator) {
	// Assumes your service worker has file name "sw.js"
    navigator.serviceWorker.register('sw.js')
    .then(reg => {
        console.log('Registration succeeded. Scope is ' + reg.scope);
    });