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

Only map without reduce is like copying a collection: http://www.mongodb.org/display/DOCS/Developer+FAQ#DeveloperFAQ-HowdoIcopyallobjectsfromonedatabasecollectiontoanother%3F