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.promise()

Steve Fahnestalk 
var promise = new Promise(function(resolve, reject) {
  // do some long running async thing…
  
  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 */ }
);
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4
4
Widmerpool 110 points 

                                    //example
function tetheredGetNumber(resolve, reject) {
  try {
    setTimeout( 
      function() {
        const randomInt = Date.now();
        const value = randomInt % 10;
        try { 
          if(value >= THRESHOLD_A) {
            throw new Error(`Too large: ${value}`);
          } 
        } catch(msg) {
            reject(`Error in callback ${msg}`); 
        }
      resolve(value);
      return;
    }, 500);
  } catch(err) {
    reject(`Error during setup: ${err}`);
  }
  return;
}

4 (4 Votes)
0
4
5
David 105 points 

                                    A Promise is in one of these states:

pending: initial state, neither fulfilled nor rejected.
fulfilled: meaning that the operation was completed successfully.
rejected: meaning that the operation failed.

4 (5 Votes)
0
0
7
Pasolainen 125 points 

                                    A promise is an object that may produce a single value sometime in the future: either a resolved value, or a reason that it's not resolved (e.g., a network error occurred)

0
0
3.75
4
DSM 105 points 

                                    /*
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) => {

});

3.75 (4 Votes)
0
0
0
Zessa 95 points 

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

0
0
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