Asynchronous in javascript

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Ariful Islam Adil(Code Lover) answered on July 14, 2020 Popularity 10/10 Helpfulness 2/10

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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

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Tags: asynchronous javascript

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Contributed on Sep 07 2021

Ariful Islam Adil(Code Lover)

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

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Source: Grepper

Tags: asynchronous asynchrono

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Contributed on Feb 24 2022

Nirvana-Forever

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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

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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 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

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Contributed on Apr 14 2023

Anshul Soni

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javascript asyncrohous example

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// Asynchronous function that returns a promise
function fetchData() {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Data fetched successfully!');
    }, 2000);
  });
}

// Asynchronous function using async/await
async function processAsyncData() {
  try {
    console.log('Fetching data...');
    const data = await fetchData(); // Waiting for the promise to resolve
    console.log('Data received:', data);
    console.log('Processing data...');
    // Simulating additional asynchronous operation
    await new Promise(resolve => setTimeout(resolve, 1000));
    console.log('Data processed successfully!');
  } catch (error) {
    console.error('Error:', error);
  }
}

// Call the asynchronous function
processAsyncData();

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Source: chat.openai.com

Tags: javascript j

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Contributed on Jun 19 2023

Homely Hyena

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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!');

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Source: developer.mozilla.org

Tags: asynchronous-javascript asynchronous-jav

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Contributed on Jul 14 2020

Rich Raven

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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*/

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Source: www.geeksforgeeks.org

Tags: asynchronous asynchrono

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Contributed on Jul 06 2022

Murithi Mwenda

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Asynchronous in javascript

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