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javascript promise

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Noor Mohammad Patwary answered on July 1, 2019 Popularity 10/10 Helpfulness 4/10

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Comment

let conditions=true;


const proms= new Promise((resolve, reject) => {
    setTimeout(() => {
        if (conditions) {
            resolve ("Hello")
        } else {
            reject ("This condition faild")
        }
    }, 2000);
});


proms.then((result) => {
    console.log(result);
})
.catch(function(error){
    console.log(error);
});

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript promise

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Contributed on Jul 18 2022

Noor Mohammad Patwary

0 Answers Avg Quality 2/10

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javascript promises

Comment

var promise = new Promise(function(resolve, reject) {
  // do some long running async thingâ€¦
  
  if (/* everything turned out fine */) {
    resolve("Stuff worked!");
  }
  else {
    reject(Error("It broke"));
  }
});

//usage
promise.then(
  function(result) { /* handle a successful result */ },
  function(error) { /* handle an error */ }
);

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 01 2019

Grepper

0 Answers Avg Quality 2/10

Promise in Javascript

Comment

<!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

what is promise in javascript

Comment

Promises are used to handle asynchronous operations in JavaScript.
They are easy to manage when dealing with multiple asynchronous operations
where callbacks can create callback hell leading to unmanageable code.

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 20 2022

Raviraj Solanki

0 Answers Avg Quality 2/10

promise in javascript

Comment

//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

javascript promise

Comment

let promise = new Promise((resolve,reject)=>{
                try {
                    resolve("some data");
                } catch (error) {
                    reject(error);
                }
            })
            
            promise.then(function (data) {
                console.log(data);
            },function (error) {
                console.error(error);
            })

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stickynotepickles.herokuapp.com

Tags: javascript j

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Contributed on Feb 18 2022

Powerful Pigeon

0 Answers Avg Quality 2/10

promise in javascript

Comment

----------------------------------------
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

Source: Grepper

Tags: javascript j

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Contributed on Jan 04 2023

Abhishek

0 Answers Avg Quality 2/10

promise in javascript

Comment

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);
})

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Aug 15 2022

Noor Mohammad Patwary

0 Answers Avg Quality 2/10

promise in javascript

Comment

/*
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

Source: Grepper

Tags: javascript j

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Contributed on Jun 20 2022

Rasel Ahmed

0 Answers Avg Quality 2/10

promise javascript

Comment

let promise = new Promise(function(resolve, reject){
  try{
  	resolve("works"); //if works
  } catch(err){
    reject(err); //doesn't work
  }
}).then(alert, console.log); // if doesn't work, then console.log it, if it does, then alert "works"

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 22 2021

Unusual Unicorn

0 Answers Avg Quality 2/10

javascript promise

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