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asynchronous programming in javascript

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Anshul Soni answered on July 14, 2020 Popularity 10/10 Helpfulness 2/10

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asynchronous programming in javascript

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In this example, the fetchData function is defined as an asynchronous function that returns a promise. The await keyword is used to pause the execution of the function until the promise is resolved, allowing the function to perform asynchronous operations without blocking the main thread.

When the fetchData function is called, it sends a request to a server using the fetch function and waits for the response. Once the response is received, the json method is used to parse the response and return it as JSON data.

The returned promise is then handled using the .then and .catch methods. If the promise is resolved successfully, the data is logged to the console. If an error occurs during the asynchronous operation, the error is caught and logged to the console.

// Define an asynchronous function that returns a promise
async function fetchData() {
  // Use the fetch() function to send a request to a server
  const response = await fetch('https://example.com/data');
  // Use the json() method to parse the response and return it as JSON
  const data = await response.json();
  // Return the data
  return data;
}

// Call the asynchronous function and handle the returned promise
fetchData()
  .then(data => {
    // Do something with the data
    console.log(data);
  })
  .catch(error => {
    // Handle any errors that occur during the asynchronous operation
    console.error(error);
  });

Coded by Anshul Soni

https://anshulsoni.tech

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: asynchronous javascript

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Contributed on Apr 14 2023

Anshul Soni

0 Answers Avg Quality 2/10

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what is asynchronous in javascript

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// some functions
function foo() {
	console.log("foo")
}
function bar() {
	console.log("bar")
}

/*  due to the javascript event-loop behavior this code
	is going to be asynchronous but what does that mean?
    
    well, first you need to understand the concept of asynchronous, 
    In computer programming, asynchronous operation means that a 
    process operates independently of other processes. 
*/
setTimeout(foo, 2000)
console.log("faz")
bar()

// this code above is going to print out:
// "faz"
// "bar"
// "foo"

/* this happens because the event loop first executes all the synchronous code 
then waits for the timer to complete and then when it's done puts the callback 
that we passed it in as a first param in something called the task queue where 
it will be added to the call stack and executed

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: asynchronous asynchrono

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Contributed on Feb 24 2022

Nirvana-Forever

0 Answers Avg Quality 2/10

Asynchronous in javascript

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//Asynchronous JavaScript
console.log('I am first');
setTimeout(() => {
    console.log('I am second')
}, 2000)
setTimeout(() => {
    console.log('I am third')
}, 1000)
console.log('I am fourth')
//Expected output:
// I am first
// I am fourth
// I am third
// I am second

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: asynchronous asynchrono

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Contributed on Sep 07 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

Asynchronous in javascript

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//Asynchronous JavaScript
console.log('I am first');
setTimeout(() => {
    console.log('I am second')
}, 2000)
setTimeout(() => {
    console.log('I am third')
}, 1000)
console.log('I am fourth')
//Expected output:
// I am first
// I am fourth
// I am third
// I am second

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: asynchronous asynchrono

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Contributed on Sep 07 2021

Ariful Islam Adil(Code Lover)

0 Answers Avg Quality 2/10

asynchronous javascript

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console.log ('Starting');
let image;

fetch('coffee.jpg').then((response) => {
  console.log('It worked :)')
  return response.blob();
}).then((myBlob) => {
  let objectURL = URL.createObjectURL(myBlob);
  image = document.createElement('img');
  image.src = objectURL;
  document.body.appendChild(image);
}).catch((error) => {
  console.log('There has been a problem with your fetch operation: ' + error.message);
});

console.log ('All done!');

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: asynchronous-javascript asynchronous-jav

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Contributed on Jul 14 2020

Rich Raven

0 Answers Avg Quality 2/10

javascript asynchronous

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-1

<script>
    document.write("Hi");
    document.write("<br>");
  
    setTimeout(() => {
        document.write("Let us see what happens");
    }, 2000);
  
    document.write("<br>");
    document.write("End");
    document.write("<br>");
</script>

/*Hi
End
Let us see what happens*/

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: www.geeksforgeeks.org

Tags: asynchronous asynchrono

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Contributed on Jul 06 2022

Murithi Mwenda

0 Answers Avg Quality 2/10

asynchronous programming in javascript

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