This post is a very interesting study of the differences between “functional-first” (F#) and “object-first” (C#) design for medium-sized software, by comparing software metrics for a number of C# and F# projects. Here are the conclusions, #3 and #4 are the most important I think. Project complexity. For a given number of instructions, a C# project is likely to have many more top level types (and hence files) than an F# one -- more than double, it seems. Fine-grained types. For a given number of modules,[...]