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JavaScript | Promise.allSettled() Method

  • Last Updated : 13 Sep, 2021

The Promise in JavaScript can be in three states pending, fulfilled or rejected. The Promise.allSettled() method in Javascript is used to get a promise when all inputs are settled that is either fulfilled or rejected.

Syntax:

Promise.allSettled(iterable);

Parameters: This method accept a single parameter iterable which takes an array of promises or a normal array which contains some objects.

Return Value: This method returns the following values:

  • If passed argument is empty, it returns a Promise that already resolved.
  • For all other cases, it returns a pending Promise.

Example 1:



Javascript




<script>
    // Illustration of Promise.allSettled()
    // Method in Javascript with Example
 
    const p1 = Promise.resolve(50);
    const p2 = new Promise((resolve, reject) =>
                    setTimeout(reject, 100, 'geek'));
    const prm = [p1, p2];
 
    Promise.allSettled(prm).
      then((results) => results.forEach((result) =>
      console.log(result.status,result.value)));
</script>

 
Output:

"fulfilled"
 50
"rejected" 
 undefined

Example 2:

Javascript




<script>
    // Simple promise that resolves
    // After a given time
    const tOut = (t) => {
      return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve(`Completed in ${t}`)
        }, t)
      })
    }
   
    // Resolving a normal promise
    tOut(1000).then(result => console.log(result)) 
    // Completed in 1000
   
    // Promise.allSettled
    Promise.allSettled([tOut(1000), tOut(2000)]).then(result =>
    console.log(result))
</script>

Output:

"Completed in 1000"
Array [Object { status: "fulfilled", value: "Completed in 1000" }, 
Object { status: "fulfilled", value: "Completed in 2000" }]

Supported Browsers: 

  • Google Chrome 6.0 and above
  • Internet Explorer 9.0 and above
  • Mozilla 4.0 and above
  • Opera 11.1 and above
  • Safari 5.0 and above

 




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