mongoDB map/reduce minus the reduce

Question

I have some 25k documents (4 GB in raw json) of data that I want to perform a few javascript operations on to make it more accessible to my end data consumer (R), a

Answer 1

When you got access to the mongo shell, it accepts some Javascript commands and then it's simpler:

map = function(item){
        db.result.insert(item);
}

db.collection.find().forEach(map);