JavaScript | Promise.allSettled() Method
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
