what is promise in javascript

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Sara
02 Jan 2019
1/*
2	A Promise is a proxy for a value not necessarily known when the promise is created. 
3    It allows you to associate handlers with an asynchronous action's eventual success 
4    value or failure reason.
5*/            
6let promise = new Promise((resolve , reject) => {
7  fetch("https://myAPI")
8    .then((res) => {
9      // successfully got data
10      resolve(res);
11    })
12    .catch((err) => {
13      // an error occured
14      reject(err);
15    });          
16});
Alessia
08 Oct 2017
1var promise = new Promise(function(resolve, reject) {
2  // do some long running async thing…
3  
4  if (/* everything turned out fine */) {
5    resolve("Stuff worked!");
6  }
7  else {
8    reject(Error("It broke"));
9  }
10});
11
12//usage
13promise.then(
14  function(result) { /* handle a successful result */ },
15  function(error) { /* handle an error */ }
16);
Luis
19 Nov 2019
1//Promise to load a file...
2//use with openFile(url, fCallback);
3//fCallback(fileContents){ //do something with fileContents}
4const loadFile = url => {
5    return new Promise(function(resolve, reject) {
6        //Open a new XHR
7        var request = new XMLHttpRequest();
8        request.open('GET', url);
9        // When the request loads, check whether it was successful
10        request.onload = function() {
11            if (request.status === 200) {
12                // If successful, resolve the promise
13                resolve(request.response);
14            } else {
15                // Otherwise, reject the promise
16                reject(Error('An error occurred while loading image. error code:' + request.statusText));
17            }
18        };
19        request.send();
20    });
21};
22const openFile = (url, processor) => {
23    loadFile(url).then(function(result) {
24            processor(result);
25        },
26        function(err) {
27            console.log(err);
28        });
29};
Noemi
01 Mar 2020
1A promise is an object that may produce a single value some time in the future: 
2either a resolved value, or a reason that it’s not resolved 
Deanne
01 Aug 2019
1// Promise is a special type of object that helps you work with asynchronous operations.
2// Many functions will return a promise to you in situations where the value cannot be retrieved immediately.
3
4const userCount = getUserCount();
5console.log(userCount); // Promise {<pending>}
6
7// 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>}.
8// This will happen because there is no data yet and we need to wait for it.
Ariella
26 Aug 2017
1Promises make async javascript easier as they are easy to use and write than callbacks. Basically , promise is just an object , that gives us either success of async opertion or failue of async operations
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