abegehr

// https://github.com/simsieg/sleepjs
const { sleep, sleepSeconds, sleepMinutes } = require('sleepjs')

// chain sleeps of different intervals
async function chainingFunc() {
  await sleep(500);
  alert("Hello");
  await sleepSeconds(1);
  alert("Hello");
  await sleepSeconds(2);

abegehr

// https://github.com/simsieg/sleepjs
const { sleep } = require('sleepjs')
 
async function myFunction() => {
  await sleep(500);
  alert("Hello");
}
 
myFunction();

abegehr

// https://www.w3schools.com/jsref/met_win_settimeout.asp
 
function myFunction() {
  setTimeout(function() {
    alert("Hello");
  }, 3000);
}
 
myFunction();

abegehr

// https://firebase.google.com/docs/firestore/quickstart
var db = firebase.firestore();

async function fetchArticle(articleId, authorId) {
  
  // get author and article docs simultaneously
  const authorPromise = db.doc("authors/" + authorId).get();
  const articlePromise = db.doc("articles/" + articleId).get();
  
  // wait until both compleeted

abegehr

// https://firebase.google.com/docs/firestore/quickstart
var db = firebase.firestore();

async function fetchArticle(articleId, authorId) {
  try {
    // get author and article docs sequentially
    const authorSnap = await db.doc("authors/" + authorId).get();
    const articleSnap = await db.doc("articles/" + articleId).get();
  }
  catch (err) {/* handle error */}

abegehr

// https://firebase.google.com/docs/firestore/quickstart

async function main() {
  try {
    const doc = await db.doc("user/" + uid).get()

    if (doc.exists) {
      console.log("User data:", doc.data());
      // use fetched data, for example in setState()
    } else {

abegehr

// https://firebase.google.com/docs/firestore/quickstart

const userPromise = db.doc("user/" + uid).get().then(doc => {
  if (doc.exists) {
    console.log("User data:", doc.data());
    // use fetched data, for example in setState()
  } else {
    console.warn("No user data.");
  }
}).catch(error => {

abegehr

// https://firebase.google.com/docs/firestore/quickstart
var db = firebase.firestore();

const userPromise = db.doc("user/" + uid).get();
const articlePromise = db.doc("article/1").get();

abegehr

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:sensors/sensors.dart';

class SensorsTest extends StatefulWidget {
  SensorsTest({Key key}) : super(key: key);

  @override
  _SensorsTestState createState() => _SensorsTestState();
}

abegehr