#ConComp Example implementations of concurrent file size comparison in various languages. This repo is somewhat inspired by todoMVC. It's useful to see how different languages approach a problem that's simple enough to understand, yet complex enough to get a feel for the language features and philosophy.

#The Problem

Is best described by example:

$ concomp file1.txt file2.txt file3.txt

file2.txt is the biggest.

$ concomp file1.txt file3.txt

The files are the same size.

That's it. Simple. A program that:

• runs from the command line
• accepts two or more parameters, where each is the name of a file
• compares the sizes of each, and
• reports which is largest.
• If they're all the same size, it should say so.

##Where's the interest? The purpose is to demonstrate the concurrency features in the language. So there's one other requirement:

• Fetching the size of the supplied files should be completed concurrently.

It's simple yet representative of a large class of problems; perform some concurrent activities, then perform a subsequent action that takes as input the result of the concurrent tasks. It's the basic pattern in map reduce.

What that means practically will differ across languages - that's the point.

To be more credible, the files to compare should be remote resources rather than local - so fetching each takes a non-trivial amount of time. However, that's not mandatory. It's not a performance test. It's about coding style. As long as the code demonstrates fetching concurrently, it doesn't really matter where the files are located.