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Promises

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Sumit Rawal answered on July 1, 2019 Popularity 7/10 Helpfulness 1/10

answer Promises

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Promises

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describe("Promises", function () {
  it("should support asserting Biggie's best track", function () {
    var artist = "Notorious B.I.G.";
    return chakram.get("https://api.spotify.com/v1/search?q="+artist+"&type=artist")
    .then(function (searchResponse) {
      var bigID = searchResponse.body.artists.items[0].id;
      return chakram.get("https://api.spotify.com/v1/artists/"+bigID+"/top-tracks?country=GB");
    })
    .then(function (topTrackResponse) {
      var topTrack = topTrackResponse.body.tracks[0];
      expect(topTrack.name).to.contain("Old Thing Back");
    });
  });
});

Popularity 7/10 Helpfulness 1/10 Language javascript

Source: dareid.github.io

Tags: javascript

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Contributed on Aug 10 2023

Sumit Rawal

0 Answers Avg Quality 2/10

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javascript promises

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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

what is a promise

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// 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 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

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 j

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Contributed on May 20 2021

Mystic Dev

0 Answers Avg Quality 2/10

javascript promises

Comment

var posts = [
  {name:"Mark42",message:"Nice to meet you"},
  {name:"Veronica",message:"I'm everywhere"}
];

function Create_Post(){
  setTimeout(() => {
    posts.forEach((item) => {
      console.log(`${item.name} --- ${item.message}`);
    });
  },1000);
}

function New_Post(add_new_data){
  return new Promise((resolve, reject) => {
    setTimeout(() => {
     posts.push(add_new_data);
      var error = false;
      if(error){
        reject("Something wrong in </>, Try setting me TRUE and check in console");
      }
      else{
        resolve();
      }
    },2000);
  })
}

New_Post({name:"War Machine",message:"I'm here to protect"})
    .then(Create_Post)
    .catch(err => console.log(err));

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.youtube.com

Tags: javascript j

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Contributed on Oct 06 2020

Outlander

0 Answers Avg Quality 2/10

js promises

Comment

let examplePromise = new Promise(function (resolve, reject) {
  let sum;
  setTimeout(function(){
    sum = 5 + 6;
    if(sum > 10) {
      resolve(sum);
    }else{
      reject('The promise has been rejected');
    }     
  }, 2000);
});

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: careerfoundry.com

Tags: javascript j

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Contributed on Apr 12 2022

Quaint Quelea

0 Answers Avg Quality 2/10

promises in js

Comment

let promise = new Promise((resolve, reject) => {
  setTimeout(() => {
    resolve("Hello, World!");
  }, 2000);
});

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: medium.com

Tags: javascript j

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Contributed on Mar 10 2023

Imran Khan

0 Answers Avg Quality 2/10

promise js

Comment

A promise is an object that may produce a single value some time in the future: 
either a resolved value, or a reason that it’s not resolved

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: medium.com

Tags: javascript j

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Contributed on Oct 02 2020

Super Starling

0 Answers Avg Quality 2/10

promise

Comment

const myPromise = new Promise((resolve, reject) => {  
    let condition;  
    
    if(condition is met) {    
        resolve('Promise is resolved successfully.');  
    } else {    
        reject('Promise is rejected');  
    }
});

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: www.freecodecamp.org

Tags: javascript j

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Contributed on Sep 07 2022

Muhammed Hashim

0 Answers Avg Quality 2/10

Promises

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