``` javascript
db.blog.posts.findOne({}, {"comments" : {"$slice" : 10}})
db.blog.posts.findOne({}, {"comments" : {"$slice" : -10}})
db.blog.posts.findOne({}, {"comments" : {"$slice" : [23, 10]}})
db.blog.posts.find({"comments.name" : "bartek"}, {"comments.$" : 1})
```