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promise states javascript

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Mysterious Monkey answered on February 11, 2021 Popularity 10/10 Helpfulness 4/10

answer promise states javascript

related how to get promise state in js

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promise states javascript

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// A JavaScript Promise can be in several states:

// - Pending - response is not ready yet. Please wait.
// - Fulfilled - response is ready. Success. Take the data.
// - Rejected - an error occurred. Handle it.

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: learn.coderslang.com

Tags: javascript promise states

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Contributed on Feb 11 2021

Mysterious Monkey

0 Answers Avg Quality 2/10

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how to get promise state in js

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// define the following function to get the PromiseState
function promiseState(p) {
  const t = {};
  return Promise.race([p, t])
    .then(v => (v === t)? "pending" : "fulfilled", () => "rejected");
}

// create 3 test Promise examples:
var a = Promise.resolve();
var b = Promise.reject();
var c = new Promise(() => {});

// demonstrated value for each Promise example
promiseState(a).then(state => console.log(state)); // fulfilled
promiseState(b).then(state => console.log(state)); // rejected
promiseState(c).then(state => console.log(state)); // pending

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: get javascript ja

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Contributed on May 15 2022

Anxious Alligator

0 Answers Avg Quality 2/10

javascript promise state

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// Check the state of a Promise

function yet(promise) {
    const yettable = {
        state: "pending",
        isPending() { return promise.state == "pending"; },
        isFulfilled() { return promise.state == "fulfilled"; },
        isRejected() { return promise.state == "rejected"; },
    };

    Object.assign(promise, yettable);

    promise
        .then(result => (promise.state = "fulfilled", result))
        .catch(err => (promise.state = "rejected", err));

    return promise;
}

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 15 2022

Daniel Trindade

0 Answers Avg Quality 2/10

promise states javascript

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