How much of mongo shell command's javascript part executed is on server?

Question

Is all of the javascript part in mongo shell commands executed on the server or on client or is it partial?

Let's say I have a command

db.mycollection.find({timestamp:{$lt:new Date()}}).forEach(function(doc){
    db.mycollection.remove(doc);
})

1. Is the new Date() executed on the client or on server?
2. Is the forEach part executed on the client or on the server?

Answer 1

If you try to execute the above code into mongo shell and enable the mongodb profiler on the server on level 2, it records only following operations:

• db.mycollection.find({timestamp:{$lt:new Date()}})
• db.mycollection.remove(doc)

The mongo shell is an interactive JavaScript interface to MongoDB.

• Is the new Date() executed on the client or on server? - On client
• Is the forEach part executed on the client or on the server? - On client

You can notice the CPU utilization by mongo process on client if it processes large data.

You can also check this question on SO.