Thursday night (31 Jan) at the F#unctional Londoners Meetup we have Zach Bray telling us all about FunScript, aka "F# to Javascript, the FunScript way!" This includes a cool integration of TypeScript metadata into F#-JavaScript programming using an F# type provider for TypeScript. Another way to look at that is that all those TypeScript programmers are now producing typed components for use from F# too :-)  All your types belong to us. Thanks guys!! FunScript lets you connect to Web APIs like Freebase and [...]

Phil Trelford recently released Foq, a small F# mocking library (with a very daring name). If most of your code is in F#, this is probably not a big deal for you, because the technique of mocking isn’t very useful in F# (at least in my experience). On the other hand, if your goal is to unit test some C# code in F#, then Foq comes in very handy. So why would you want to write your unit tests in F# in the first place? Let’s start with some plain old C# code, like this:namespace CodeBase { using System; [...]

.Net 4.5 introduced a handy little new method Comparer<T>.Create to aid the creation of bespoke comparers, which is great because it means that you don’t have to define a new Comparer class when it is going to be needed once. In case you’re wondering, it’s still not possible to define anonymous implementation of interfaces in [...]

I'm very pleased to see that the latest and greatest Try F# 3.0 has been released today!  Try F# is a web-based tool for learning and exploring F# 3.0, a simple and pragmatic programming language combining functional, object-oriented and information-rich programming. F# is open source and cross-platform, see the F# Software Foundation for details. Microsoft contribute to F# in multiple ways, including the Visual F# tools. This site allows easy learning of key F# principles, creating, editing and running F#[...]

This article introduces a new F# package that makes it possible to write literate F# programs that combine code with documentation. Given an F# script with a special comments or Markdown document with F# code, you get a nicely formatted HTML that can be used to build documentation or write blogs.