curl -X GET https://api.box.com/2.0/users/12345/memberships \
     -H 'Authorization: Bearer <ACCESS_TOKEN>'

BoxCollection<BoxGroupMembership> memberships = await client.GroupsManager
    .GetAllGroupMembershipsForUserAsync(userId: "11111");

BoxUser user = new BoxUser(api, id);
Iterable<BoxGroupMembership.Info> memberships = user.getAllMemberships();
for (BoxGroupMembership.Info membershipInfo : memberships) {
    // Do something with the membership.
}

user_memberships = client.user(user_id='33333').get_group_memberships()
for membership in user_memberships:
    print('User is in the {0} group'format(membership.group.name))

var userID = '22222';
client.users.getGroupMemberships(userID)
	.then(memberships => {
		/* memberships -> {
			total_count: 1,
			entries: 
			[ { type: 'group_membership',
				id: '12345',
				user: 
					{ type: 'user',
					id: '22222',
					name: 'Alison Wonderland',
					login: 'alice@example.com' },
				group: { type: 'group', id: '11111', name: 'Employees' },
				role: 'member' } ],
			limit: 100,
			offset: 0 }
		*/
	});

client.groups.listMembershipsForUser(userId: "12345") {
    switch results {
    case let .success(iterator):
        for i in 1 ... 10 {
            iterator.next { result in
                switch result {
                case let .success(membership):
                    print("Group Membership with ID \(membership.id) was retrieved")
                case let .failure(error):
                    print(error)
                }
            }
        }
    case let .failure(error):
        print(error)
    }
}