javascript - How to convert a jQuery Deferred object to an ES6 Promise

Question

Is this the correct way to convert jQuery Deferred to a Promise?

var p = Promise.resolve($.getJSON('api/values', null));

Are there any other ways to do this?

What are the limitations? I've read somewhere that jQuery deferred does not support exceptions, so I assume that a promise created out of a deferred would neither. Is this correct?

Answer 1

I am not sure if that would work. I would recommend:

var p = new Promise(function (resolve, reject) {
  $.getJSON('api/values', null)
    .then(resolve, reject);
});

preferably you could create an adaptorfunction like:

var toPromise = function ($promise) {
  return new Promise(function (resolve, reject) {
    $promise.then(resolve, reject);
  });
});

var p = toPromise($.getJSON('api/values', null));