Key Concepts

Review core concepts you need to learn to master this subject

Asynchronous JavaScript function

Resolving JavaScript Promises

Async Await Promises

Using async await syntax

JavaScript async…await advantage

Async Function Error Handling

JavaScript aysnc await operator

Asynchronous JavaScript function

function helloWorld() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello World!');
    }, 2000);
  });
}

const msg = async function() { //Async Function Expression
  const msg = await helloWorld();
  console.log('Message:', msg);
}

const msg1 = async () => { //Async Arrow Function
  const msg = await helloWorld();
  console.log('Message:', msg);
}

msg(); // Message: Hello World! <-- after 2 seconds
msg1(); // Message: Hello World! <-- after 2 seconds

An asynchronous JavaScript function can be created with the async keyword before the function name, or before () when using the async arrow function. An async function always returns a promise.

Async Await
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