Modification of a MongoDB nested document-updating data with an array modifier

Novice MongoDB May and I have the same question, MongoDB is a document-type, then if a document nested another document, if the nested document is added to the search and deletion.
It's like this: How do you add and revise the name inside the auther? Let's take a look at this blog post.

Here are a few modifiers:$push,$pop,$pull

• First add a name:

db.myFirstCollection.update({_id:1},{$push:{"auther":{"name":1}}})

• Delete the last value, or 1 if you want to delete the first value

db.myFirstCollection.update({_id:1},{$pop:{"auther":1}})

• Delete specified value

db.myFirstCollection.update({_id:1},{$pull:{"auther":{"name":1}}})

• If you want to add an age field to the first value in Auther

db.myFirstCollection.update({"_id" :1},{$set:{"auther.0.age":22}})

Modification of a MongoDB nested document-updating data with an array modifier