Promise in ES6

Outrageous Ostrich answered on August 17, 2021 Popularity 9/10 Helpfulness 4/10

answer Promise in ES6

Promise in ES6

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function makeRequest(method, url) {
  return new Promise((resolve, reject) => {
    let request = new XMLHttpRequest()

    request.open(method, url)
    request.onload = resolve
    request.onerror = reject
    request.send()
  })
}

makeRequest('GET', 'https://url.json')
  .then((event) => {
    console.log(event.target.response)
  })
  .catch((err) => {
    throw new Error(err)
  })

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: softhunt.net

Tags: javascript promise

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Contributed on Apr 10 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

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new promise function

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const myPromise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve('foo');
  }, 300);
});

myPromise
  .then(handleResolvedA, handleRejectedA)
  .then(handleResolvedB, handleRejectedB)
  .then(handleResolvedC, handleRejectedC);

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Source: developer.mozilla.org

Tags: function functio

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Contributed on Aug 17 2021

Friendly Fly

0 Answers Avg Quality 2/10

Promise in Javascript

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
   <script>
    const promise = new Promise((resolve, reject) => {
        setTimeout(()=>{
        let flag = 0; // true fasle 1 or 0
        if(!flag){
           resolve({name:'Malik Amir Hamza' , id:1});
        }
        else{
            reject('error something went wrong');
        }
        },2000);
    });

    promise
    .then((user)=>{console.log(user)})
    .catch((error)=>{console.log(error)});

</script> 
</body>
</html>

Popularity 9/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 12 2024

Malik Amir Hamza

0 Answers Avg Quality 2/10

promise in javascript

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//promise is an object that give result of request or reject request
//creation of promise
const promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    console.log('got the user');
    //     resolve({ user: 'shirshak' });
    reject(new Error('User not logged in'));
  }, 2000);
});

//consume of promise
promise
  .then(user => {
    console.log(user);
  })
  .catch(err => console.log(err.message));

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: javascript j

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Contributed on Dec 19 2022

Shirshak Kandel

0 Answers Avg Quality 2/10

promise in javascript

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----------------------------------------
Promise.all() allSettled() race()
----------------------------------------
* Promise.all() :
  - all() method is used when all promises are expected to return the
    resolved state.   
  - showing result at a particular follow sequence.
// Example: 
const p1 = new Promise((resolve,reject)=>{ 
setTimeout(()={ resolve("Promise3"); },2000) );
Promise.all([p1,p2,p3]).then((prMsgs)=>{ console.log(prMsgs); }) 

* Promise.allSettel():
  - showing all the result regardless resolve or reject
  - It will show resolve or reject promises one by one.

* Promise.race(): 
  - From the list of promises if any promise returns the result first 
    then it will show that promise result. 

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Promise : 
//Simple promise example: 
const data = new Promise((resolve, reject) => {
	if (1 > 3) {
		resolve('Working fine')
	} else {
		reject('Something wrong')
	}
})
data.then((res) => {
	console.log(`Success=>`, res)
})
data.catch((err) => {
	console.log(`Error=>`, err)
})

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript j

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Contributed on Jan 04 2023

Abhishek

0 Answers Avg Quality 2/10

promise in javascript

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const studentRol=new Promise((resolve, reject) => {
    setTimeout(()=>{
        /**this function will give the value Of tageted studebt Roll number  */
           let RollOffStd=[1,2,3,4,5,6,7,8];
        
            for (let index = RollOffStd[RollOffStd.length-1]+1 ; index <50; index++) {
                RollOffStd.push(index)
                
            }
            
            resolve( RollOffStd)
            
            reject('My name is Noor mohammad ')
      

    },1000)
})


const mybiodata=(gRollOfStudent /* this is First parameter OF ( mybiodata function ) and You can change parameter value  */)=>{
    return new Promise((resolve, reject) => {
        setTimeout((x) => {
           let  bio={
                myname : 'Noor mohammad Patwary ' ,
                age : 25 ,
            }

            resolve(`my name is ${bio.myname } and my age =  ${bio.age } and my roll is =${x} ` )
        }, 1000,gRollOfStudent);
    })
}

studentRol.then(( RollOfStudent)=>{
    console.log(RollOfStudent); /** From here we are gating the Value OF student roll number  */
    mybiodata(RollOfStudent[1] /* this is First Argument OF ( mybiodata function )*/).then((fff)=>{
        console.log(fff);
    })

}).catch((x)=>{
    console.log(x);
})

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Tags: javascript j

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Contributed on Aug 15 2022

Noor Mohammad Patwary

0 Answers Avg Quality 2/10

promise in javascript

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/*
A promise is a building object of JavaScript, using it we can easily do 
asynchronous tasks. Also, the concept that is used to create clean code 
basically promises.
*/
//Promise
let firstPromise = new Promise((resolved, reject) => {
    let fullName = 'Muhammad Shahnewaz';
    setTimeout(() => resolved(fullName), 3000);  //we need to use setTimeout() 
}).then((name) => {
    console.log('I am ' + name);    //Muhammad Shahnewaz
});

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript j

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Contributed on Jun 20 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

Promises in ES6

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function asyncFunc() {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
          const result = Math.random();
          result > 0.5 ? resolve(result) : reject('Oppps....I cannot calculate')
        }, 1)
    });
}

for (let i=0; i<10; i++) {
	asyncFunc()
    	.then(result => console.log('Result is: ' + result))
    	.catch(result => console.log('Error: ' + result))
}

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Tags: javascript j

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Contributed on Apr 10 2022

Outrageous Ostrich

0 Answers Avg Quality 2/10

promise syntax in js

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// make new promise ... so this object will promise us that it will hold an Asynchronous action
// some times promise resolve and some times promise get rejected
const A = new Promise((resolve, reject) => {
    setTimeout(() => {
        // here we pass argument if promise get resolved
        resolve('Done');

        // here we pass argument if promise get rejected
        reject('Didn"t');
    }, 3000);
});


// design handling callback function for resolve 
let handleResolvedA = (massage)=>{console.log(massage)}

// design handling callback function for reject 
let handleRejectedA = (massage)=>{console.log(massage)}


// do handling for both
A.then(handleResolvedA, handleRejectedA)

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Jun 10 2022

Mr. coder

0 Answers Avg Quality 2/10

promise in js

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let promise = new Promise((resolve, reject) => {
  // Asynchronous operation
  if (errorOccurred) {
    reject(new Error("An error occurred."));
  } else {
    resolve(result);
  }
});

Popularity 8/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Apr 24 2024

Colorful Copperhead

0 Answers Avg Quality 2/10

Promise in ES6

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