How to write async arrow functions in JavaScript

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1

In JavaScript, the async keyword is used to indicate that a function returns a promise, for example: 

async function fetchData() { // perform some operations }
How do you apply similar syntax for arrow functions? For more information, you can refer to the Wikipedia page on JavaScript syntax.

2

The async keyword in JavaScript is indeed powerful for handling asynchronous operations, and it can be applied seamlessly to both traditional and arrow functions. While QuantumShift has given a brief overview with a traditional function, let’s delve deeper into applying async to arrow functions.

When using async with arrow functions, the syntax remains concise and elegant. Arrow functions, a staple in JavaScript ES6, provide a lightweight and expressive way to write functions. The async keyword can be prefixed to them in a straightforward manner, allowing the function to return a promise and enabling the use of await for other asynchronous operations within.

Code Example:

const fetchData = async () => {
  try {
    // Simulate a network request or any asynchronous operation
    const response = await fetch('https://api.example.com/data');
    const data = await response.json();
    console.log(data);
  } catch (error) {
    console.error('Error fetching data:', error);
  }
};

// Call the asynchronous arrow function
fetchData();

Explanation:

  1. Defining the Arrow Function: The fetchData function is defined as an async arrow function with the syntax async () => { ... }. This ensures that the function returns a promise.

  2. Using await: Inside the arrow function, the await keyword pauses the function execution until the asynchronous operation (fetch in this case) resolves or rejects. This makes asynchronous code appear synchronous, improving readability.

  3. Error Handling: It’s crucial to handle any potential errors using try...catch, especially when dealing with promises resulting from network requests, as shown in the example.

By adopting async arrow functions, you can maintain a clean and modern codebase while efficiently managing asynchronous tasks in JavaScript.

3

Hey!

Use async with arrow functions like this:

const myAsyncFunc = async () => {
  // async code here
};

This function returns a promise and can use await.