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javascript - Return from a promise then()

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thecodeteacher answered on June 4, 2020 Popularity 10/10 Helpfulness 3/10

answer javascript - Return from a promise then()

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javascript - Return from a promise then()

Comment

function justTesting(input) {
    return new Promise(function(resolve, reject) {
        // some async operation here
        setTimeout(function() {
            // resolve the promise with some value
            resolve(input + 10);
        }, 500);
    });
}

justTesting(29).then(function(val) {
   // you access the value from the promise here
   log(val);
});

// display output in snippet
function log(x) {
    document.write(x);
}

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: worcraft-algeria-dz.com

Tags: javascript promise return

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Contributed on Jul 28 2022

thecodeteacher

0 Answers Avg Quality 2/10

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javascript return promise

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function doSomething() {
  return new Promise((resolve, reject) => {
    console.log("It is done.");
    // Succeed half of the time.
    if (Math.random() > .5) {
      resolve("SUCCESS")
    } else {
      reject("FAILURE")
    }
  })
}

const promise = doSomething(); 
promise.then(successCallback, failureCallback);

Popularity 10/10 Helpfulness 5/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jun 04 2020

Elyesc4

0 Answers Avg Quality 2/10

js function that return a promise example

Comment

// ? created a function that returns a promise, take a parameter of a boolean
function myPromise(bool) {
  return new Promise((resolve, reject) => {
    if (bool) {
      resolve("I have succeeded");
    } else {
      reject("I have failed");
    }
  });
}

// ? call the function and pass in a boolean
myPromise(true).then((res) => console.log(res));
myPromise(false).then((res) => console.log(res)).catch((err) => console.log(err));

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 28 2022

Omar

0 Answers Avg Quality 2/10

return then javascript

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const promise1 = new Promise((resolve, reject) => {
  resolve('Success!');
});

promise1.then((value) => {
  console.log(value);
  // expected output: "Success!"
});

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 19 2021

Undefined

0 Answers Avg Quality 2/10

Create A Promise And Then Return It

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let fetchSent =	fetch("/test", {method:"POST", body: JSON.stringify({name:"NAME NAME NAME"}), headers: {'Content-type': 'application/json; charset=UTF-8'}});
const p1 = new Promise((resolve, reject) => {
  resolve(fetchSent);
  // or
  // reject(new Error("Error!"));
})
	 

 return p1;
/*console.log(p1) will yield the fetch promise that was sent to you*/

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 22 2022

Javasper

0 Answers Avg Quality 2/10

js return a promise

Comment

function myAsyncFunction(url) {
  return new Promise((resolve, reject) => {
    const xhr = new XMLHttpRequest();
    xhr.open("GET", url);
    xhr.onload = () => resolve(xhr.responseText);
    xhr.onerror = () => reject(xhr.statusText);
    xhr.send();
  });
}

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 23 2020

Tender Turkey

0 Answers Avg Quality 2/10

javascript - Return from a promise then()

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