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Define an async function

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Xifré Font answered on August 24, 2020 Popularity 10/10 Helpfulness 3/10

answer Define an async function

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Define an async function

Comment

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
  });
});

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.theodinproject.com

Tags: function javascript

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Contributed on Jun 13 2022

Xifré Font

0 Answers Avg Quality 2/10

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example of async and await in javascript

Comment

// example of async and await in javascript
// First create promise
let myPromise = () => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Yay, I resolved!')
    }, 1000);
  });
}

// async without await keyword
async function noAwait() {
 let value = myPromise();
 console.log(value);
}
 
// async with await keyword
async function yesAwait() {
 let value = await myPromise();
 console.log(value);
}
 
noAwait(); // Prints: Promise { <pending> }
yesAwait(); // Prints: Yay, I resolved!

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 13 2022

Chetan Nada

0 Answers Avg Quality 2/10

async function in javascript

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: function functio

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Contributed on Feb 05 2022

Inquisitive Iguana

0 Answers Avg Quality 2/10

what is an async function

Comment

// 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();

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: function functio

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Contributed on Jan 14 2022

Tough Tuatara

0 Answers Avg Quality 2/10

javascript async/await

Comment

//ORIGINAL
//each .then() returns a promisse and can be chained. The .then() will run after the previous one has finished. It emulates an async/await behavior.

fetch('https://jsonplaceholder.typicode.com/users')//fetch the content
  .then((response) => response.json())//then use that content and convert it to a javascript object
  .then(users => {
    const firstUser = users[0];
    console.log(firstUser);
    return fetch('https://jsonplaceholder.typicode.com/posts?userId=' + firstUser.id);
  })//then return the content from posts related to that user ID
  .then((response) => response.json())//then use that content and convert it to a javascript object
  .then(posts => console.log(posts));//then log the result


//ASYNC/AWAIT
const myAsyncFunction = async () => {//define that this will be asynchronous
  const usersResponse = await fetch('https://jsonplaceholder.typicode.com/users');//wait for the fecth result and put it in the variable
  const users = await usersResponse.json();//wait for the previous item to be done, transform it into a javascript object and put it in the variable
  const secondUser = users[1];

  console.log(secondUser);//then log the result

  const postsResponse = await fetch('https://jsonplaceholder.typicode.com/posts?userId=' + secondUser.id);//wait for the previous item to be done, wait for the fecth result and put it in the variable
  const posts = await postsResponse.json();//wait for the previous item to be done, transform it into a javascript object and put it in the variable

  console.log(posts);//then log the result
}

myAsyncFunction();

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Nov 01 2022

Marcelo Cortez

0 Answers Avg Quality 2/10

async function javascript

Comment

//Async function (JAVASCRIPT)
//async function have 1 main purpose:

//Being able to use 'await' in a function
function example() {
return await fetch('https://mysite.com/api'); //error
}

async function smartexample() {
return await fetch('https://mysite.com/api'); //mhmm!
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: function functio

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Contributed on Sep 20 2022

Charming Chimpanzee

0 Answers Avg Quality 2/10

js async await

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let line =
  "Quisque vel rutrum lacus. Morbi sed finibus elit, in dictum nulla. Ut ac fermentum lectus, at molestie leo. Etiam ligula eros, placerat ut mattis at, aliquam ac lectus. Vivamus a ultrices odio. Sed vulputate dapibus sem sit amet imperdiet. Interdum et malesuada fames ac ante ipsum primis in faucibus. Morbi mollis felis pellentesque, bibendum sapien eu, bibendum nunc. Vivamus faucibus, nunc eget dapibus consectetur, diam dolor iaculis mauris, at tristique dui quam at neque. Maecenas ligula ex, ultricies dignissim dui eget, suscipit elementum tellus. Aliquam erat volutpat. Mauris semper quam vitae faucibus accumsan. Duis laoreet auctor tellus, pulvinar elementum est pellentesque ornare. Morbi bibendum scelerisque luctus. Phasellus elementum dignissim sapien sed dignissim.Quisque vel rutrum lacus. Morbi sed finibus elit, in dictum nulla. Ut ac fermentum lectus, at molestie leo. Etiam ligula eros, placerat ut mattis at, aliquam ac lectus. Vivamus a ultrices odio. Sed vulputate dapibus sem sit amet imperdiet. Interdum et malesuada fames ac ante ipsum primis in faucibus. Morbi mollis felis pellentesque, bibendum sapien eu, bibendum nunc. Vivamus faucibus, nunc eget dapibus consectetur, diam dolor iaculis mauris, at tristique dui quam at neque. Maecenas ligula ex, ultricies dignissim dui eget, suscipit elementum tellus. Aliquam erat volutpat. Mauris semper quam vitae faucibus accumsan. Duis laoreet auctor tellus, pulvinar elementum est pellentesque ornare. Morbi bibendum scelerisque luctus. Phasellus elementum dignissim sapien sed dignissim.";


async function CountChar (sentence) {
  const count = await sentence.length;
  const result = (count * 1000000000); // making a big calculation
  console.log(result);
  
}


CountChar(line); // this will print at the last because its big calculation then other and this is the magic of async function. 

// those will print first because and not hold exicution 
console.log("I am first");  
console.log("I am second");
console.log("I am third");

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: async-await asyn

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Contributed on Feb 18 2023

Omar

0 Answers Avg Quality 2/10

async-await

Comment

// this code is to retry with exponential backoff
function wait (timeout) {
 return new Promise((resolve) => {
setTimeout(() => {
  resolve()
}, timeout);
 });
}
async function requestWithRetry (url) {
 const MAX_RETRIES = 10;
 for (let i = 0; i <= MAX_RETRIES; i++) {
try {
  return await request(url);
} catch (err) {
  const timeout = Math.pow(2, i);
  console.log('Waiting', timeout, 'ms');
  await wait(timeout);
  console.log('Retrying', err.message, i);
}
 }
}

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: www.interviewbit.com

Tags: async-await asyn

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Contributed on Oct 03 2023

mani raddy

0 Answers Avg Quality 2/10

await async

Comment

function afterPrintSave() {
    Xrm.Page.data.save().then(
        function () {
            resolve();
        },
        function (err) {
            resolve(alert(err.message));
        }
    );
}

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 24 2020

Sore Seahorse

0 Answers Avg Quality 2/10

Javscript Async Function

Comment

-2

// async function example

async function f() {
    console.log('Async function.');
    return Promise.resolve(1);
}

f();

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: function functio

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Contributed on May 22 2022

SAMER SAEID

0 Answers Avg Quality 2/10

Define an async function

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