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Promise

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Mystic Dev answered on October 6, 2020 Popularity 10/10 Helpfulness 2/10

answer Promise

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Promise

Comment

let doSecond = () => {
  console.log('Do second.')
}

let doFirst = new Promise((resolve, reject) => {
  setTimeout(() => {
    console.log('Do first.')

    resolve()
  }, 500)
})

doFirst.then(doSecond)

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.taniarascia.com

Tags: javascript promise

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Contributed on May 20 2021

Mystic Dev

0 Answers Avg Quality 2/10

Closely Related Answers

javascript promise

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 j

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Contributed on Jul 18 2022

Noor Mohammad Patwary

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);
            })

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Source: stickynotepickles.herokuapp.com

Tags: javascript j

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Contributed on Feb 18 2022

Powerful Pigeon

0 Answers Avg Quality 2/10

what is a promise

Comment

// Promise is a special type of object that helps you work with asynchronous operations.
// Many functions will return a promise to you in situations where the value cannot be retrieved immediately.

const userCount = getUserCount();
console.log(userCount); // Promise {<pending>}

// In this case, getUserCount is the function that returns a Promise. If we try to immediately display the value of the userCount variable, we get something like Promise {<pending>}.
// This will happen because there is no data yet and we need to wait for it.

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: learn.coderslang.com

Tags: javascript j

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Contributed on Feb 11 2021

Mysterious Monkey

0 Answers Avg Quality 2/10

Promises ex.

Comment

console.log('some piece of code');
examplePromise.then(function(result){
  console.log(result);
}).catch(function (error) {
  console.error(error);
});
console.log('another piece of code');

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: careerfoundry.com

Tags: javascript j

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Contributed on Sep 08 2021

Blue Beetle

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

promise javascript

Comment

let num = 10;
//call back function
const promis = new Promise(function (resolve, reject) {

  if (num > 5) {

    //this resolve method will send data to resoleveData variable
    resolve(" Problem resolved successfully")
  }
  else {
    //this reject method will send data to rejectData variable
    reject("sorry problem couldn't solve")
  }

})
//resoleveData variable
promis.then(function (resolveData) {

  console.log(resolveData)
  //rejectData variable
}).catch(function (rejectData) {

  console.log(rejectData)
})

Popularity 10/10 Helpfulness 3/10 Language javascript

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Contributed on Dec 21 2021

SkiLL3r

0 Answers Avg Quality 2/10

js promise

Comment

const executorFunction = (resolve, reject) => {
  if (someCondition) {
      resolve('I resolved!');
  } else {
      reject('I rejected!'); 
  }
}
const myFirstPromise = new Promise(executorFunction);

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 16 2021

0xTony143

0 Answers Avg Quality 2/10

promise js

Comment

We use promise to make a  AsyncFunction, cose simetime we have to wait that function give 
us some result.
Example, if we use ajax we have await ajax data or statament.
_____________________________________
Make a simple example.
_____________________________________
var asyncronus_function= (number)=>
		{
			return new Promise( (accept, reject)=>
			{
			})
		}                 
_____________________________________
this function return a promise Object, thet required a function executor
this functions (accept, reject) are defined in the executor 
function, that was needed in promise constructor.
Syntax: new Promise (executor)
executor= (accept, reject) =>{}

if function end well we return a accept(), otherwise reject()
_____________________________________
Let complete asyncronus_function
_____________________________________
var asyncronus_function= (number)=>
		{
			return new Promise( (accept, reject)=>
			{
				if(number>10)
				return accept("my first async");
				return reject("my first async error")
			})

		}
if it dont return any of this 2 function, Promise state is [PENDING] ,
if return accept is [RESOLVED]  end if return reject is [REJECTED]
_____________________________________
how we can retrieve accept or reject?
_____________________________________
there is two methods really important, that we have to consider afther we call this function
1) .then(function(error){}) is call when promise state is [RESOLVED]
2) .error(function(error){}) is call when promise state is [REJECTED]
3) do nothing if [PENDING]
_____________________________________
let call asyncronus_function()!!! 
_____________________________________
	asyncronus_function(MY_NUMBER).then(function(data)
        {
			console.log(data)
    	}).catch(error => 
        {
      			console.log(error)
    	});
		
if  MY_NUMBER> 10 ,asyncronus_function print data : OUTPUT my first async
if MY_NUMBER<10 , asyncronus_function print error : OUTPUT my first async error
HOPE it halp and have a nice day!

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 06 2020

Ax_Misaki_Mei

0 Answers Avg Quality 2/10

js promise

Comment

const prom = new Promise((resolve, reject) => {
  resolve('Yay!');
});
 
const handleSuccess = (resolvedValue) => {
  console.log(resolvedValue);
};
 
prom.then(handleSuccess); // Prints: 'Yay!'

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 21 2021

0xTony143

0 Answers Avg Quality 2/10

promise javascript

Comment

/*
Promise is a constructor function, so you need to use the new keyword to 
create one. It takes a function, as its argument, with two parameters - 
resolve and reject. These are methods used to determine the outcome of the
promise. 
The syntax looks like this:
*/

const myPromise = new Promise((resolve, reject) => {

});

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Source: www.freecodecamp.org

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Contributed on Jan 16 2021

OuzOzdemir

0 Answers Avg Quality 2/10

Promise

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