Remote iterators

Consider also that a reader may be a proxy for a remote reader. A promise iterator be easily backed by a promise for a remote object.

function RemotePromiseIterator(promise) {
    this.remoteIteratorPromise = promise.invoke("iterate");
}
RemotePromiseIterator.prototype.next = function (value) {
    return this.remoteIteratorPromise.invoke("next");
};

var remoteReader = remoteFilesystem.invoke("open", "primes.txt");
var reader = new RemotePromiseIterator(remoteReader);
reader.forEach(console.log);

Apart from then and done, promises provide methods like get, call, and invoke to allow promises to be created from promises and for messages to be pipelined to remote objects. An iterate method should be a part of that protocol to allow values to be streamed on demand over any message channel.