Retrieve List/Library "Shared With" Users and Groups using Javascript

Question

I can retrieve Shared With info from a SharePoint 2013 (On Premisses) List/Library (not an item) using Javascript?

I thought it could be available through SP.ObjectSharingInformation.getObjectSharingInformation method, but I´m stucked on getSharedWithUsers() method throwing an error like The collection has not been initialized.

Should I load other properties in context?

My bitcode, trying to get a simple count of shared users/groups:

var ctx = new SP.ClientContext(_spPageContextInfo.webServerRelativeUrl);
var list = ctx.get_web().get_lists().getById(_spPageContextInfo.pageListId);
ctx.load(list);
var su = SP.ObjectSharingInformation.getObjectSharingInformation(ctx, list);
console.log(su.getSharedWithUsers().get_count());

Error:

The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested.

Answer 1

Few things are missing

1. Loading su.getSharedWithUsers()
2. Calling ctx.executeQueryAsync()

Modified code

var ctx = new SP.ClientContext(_spPageContextInfo.webServerRelativeUrl);
var list = ctx.get_web().get_lists().getById(_spPageContextInfo.pageListId);
var su = SP.ObjectSharingInformation.getObjectSharingInformation(ctx, list);

var sharedWithUsers = su.getSharedWithUsers();
ctx.load(sharedWithUsers);

ctx.executeQueryAsync(function() {
    console.log(sharedWithUsers.get_count());
}, function() {

});