javascript - Promise.defer() browser support

Question

I am looking for a way to create deferred object which will be resolved outside the current scope. I like deferred objects and as I see Promise.defer() in Chrome 38 returns the deferred object.

But in latest Firefox 34 Promise.defer is undefined as well in Safari 8.0.

So I can't use Promise.defer everywhere now. What about future status? Will it be implemented in other browsers or will be removed as deprecated?

Answer 1

Although I doubt this is a good idea, but technically you can implement custom deferred object based on Promises. For example:

function defer() {
    var deferred = {};
    var promise = new Promise(function(resolve, reject) {
        deferred.resolve = resolve;
        deferred.reject  = reject;
    });
    deferred.promise = promise;
    return deferred;
}

var deferred = defer();

deferred.promise.then(function(data) {
    document.body.innerHTML += '<p>Resolved: ' + data + '</p>';
});

document.body.innerHTML = '<p>Deferred created.</p>';

setTimeout(function() {
    deferred.resolve(123);
}, 2000);