“asynchrische Funktion JavaScript” Code-Antworten

Async Awiat

const data = async ()  => {
  const got = await fetch('https://jsonplaceholder.typicode.com/todos/1');
  
  console.log(await got.json())
}

data();
Salo Hopeless

Async erwartet

// example using promise
const user = () => {
	fetch("https://randomuser.me/api/?results=1")
    .then((data) => {
         console.log(data); // here you recive data
    }).catch((err)=>{
         console.log(err); // here error
    });
}

// example using async/await

const user = async () => {
  	// you must have use async keyword before use await
	const data = await fetch("https://randomuser.me/api/?results=1");
  	console.log(data); // if error occured it will be null or empty
}
Wandering Wryneck

Definieren Sie eine asynchronisierte Funktion

const yourAsyncFunction = async () => {
    // do something asynchronously and return a promise
    return result;
  }
  
anArray.forEach(async item => {
   // do something asynchronously for each item in 'anArray'
   // one could also use .map here to return an array of promises to use with 'Promise.all()'
 });
 
server.getPeople().then(async people => {
  people.forEach(person => {
    // do something asynchronously for each person
  });
});
Xifré Font

Rückruffunktion JS

function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback) {
  var name = prompt('Please enter your name.');
  callback(name);
}

processUserInput(greeting);

asynchrische Funktion JavaScript

const foo = async () => {
   await// do something
}
// OR
async function foo() {
  await// do something
}
Inquisitive Iguana

Was ist eine asynchronische Funktion?

// Old School Javascript Invoke
(async function() {
	await someAsyncFunction();
})();

//New ES6 Javascript Invoke
(async () => {
	await someAsyncFunction();
})();

//Example (async & await)
function delayResult() {
 return new Promise(resolve => {
   setTimeout(() => {
     resolve(‘Done’);
   }, 5000)
 })
}
async function getResult() {
 let result = await delayResult();
 return result;
}
getResult();

//New Example 
const data = async ()  => {
  const got = await fetch('https://jsonplaceholder.typicode.com/todos/1');
  
  console.log(await got.json())
}

data();
Tough Tuatara

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