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what does an async function do?
An async function in JavaScript allows you to write asynchronous code that is easier to read and understand. It allows you to use the 'await' keyword to pause the execution of the function until a promise is resolved or rejected. This helps in handling asynchronous operations more conveniently, such as making API calls, reading/writing to databases, or working with files.
Example:
javascript Copy code
async function fetchData(url) {
try {
const response = await fetch(url);
const data = await response.json();
return data;
} catch (error) {
console.log(error);
}
}
In the above example, the 'fetchData' function is declared as async. It uses the 'await' keyword to pause the execution until the fetch request is completed and the response is received. This allows us to write asynchronous code in a more sequential and readable manner.
what is an async function in javascript
In JavaScript, an async function is a function that allows you to write asynchronous code using the await keyword. It enables you to write cleaner and more readable code when dealing with asynchronous operations like fetching data from an API or reading/writing files.
Inside an async function, you can use the await keyword to pause the execution of the function until a promise is resolved or rejected. This makes it easier to work with promises and handle asynchronous operations in a more synchronous-like manner.
Here's an example of an async function in JavaScript:
javascript Copy code
async function fetchData() {
try {
const response = await fetch('https://api.example.com/data');
const data = await response.json();
console.log(data);
} catch (error) {
console.log(error);
}
}
fetchData();
In this example, the fetchData function is declared as async. It uses the await keyword to pause the execution and wait for the fetch request to be resolved before moving on to the next line of code. This helps to ensure that we have the data before attempting to log it to the console.
Note: The use of async functions requires support for Promises, which is available in modern JavaScript environments.
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