Past Meetup

Mark Seemann: From Dependency injection to dependency rejection (F# MVP)

This Meetup is past

64 people went

Every last Tuesday of the month

Location visible to members


For this Meetup, and celebrating our 4th Year Anniversary, we have made a small collaboration with SiteImprove ( in order to provide you a talk with Mark Seemann (


17:45 Doors open

18:00 Jannick Johnsen opens the meetup with Welcome to Siteimprove

18:10 Mark Seemann presents

19:10 Mark Seemann Q&A

19:30 Open Bar at the Siteimprove Bar – offering soft drinks, wine, draft beer

21:00 Doors close

From Dependency injection to dependency rejection


In object-oriented design, dependency injection is a well-known design pattern, although it's a complicated solution to the problem of decoupling. Functional programming offers a simpler way.

This talk examines dependency injection in object-oriented design, and explains how it's not required (nor desired) in functional programming. You'll also learn how a proper functional design eliminates the need for mocks and stubs in unit testing, enabling you to entirely reject the notion of dependencies.

You don't need to know Haskell or F# to attend this session; relevant syntax will be explained just-in-time. Object-oriented examples will be in C#.


I'm a professional programmer and software architect living in Copenhagen, Denmark, and currently an independent advisor. I enjoy reading, drawing, playing the guitar, good wine, and gourmet food.

Mark has been awarded Microsoft Most Valuable Professional (MVP) a total of five times:

More information about Mark, please visit his blog:


SiteImprove, Ramón and Joakim