In this episode I talk with Scott Wlaschin. We talk on the topic of his upcoming book Domain Modeling Made Functional, and using F# (and ML family type system languages) with Domain Driven Design.Our Guest, Scott Wlaschin@ScottWlaschin on TwitterF# for fun and profitDomain Modeling Made FunctionalConference AnnouncementsCurry On Barcelona will be taking place June 19-20th. For more information, visit http://www.curry-on.org/2017/.Scala Wave 2017 will be taking place July 7th and 8th. Visit scalawave.io to find out more and to register.O’Reilly Fluent Conference will be taking place June 19–22, 2017 in San Jose, California. Visit http://www.oreilly.com/pub/cpc/61309 to find out more and to register, and use code USRG for 20% off.EuroClojure will be taking place in Berlin, Germany on July 20th & 21st. Visit http://2017.euroclojure.org/ for more information and to keep updated.BusConf will be taking place the 3rd-5th of August in Frankfurt, Germany. Registration is open, and more information can be found at http://www.bus-conf.org/.The Strange Loop coming! It will be held in St. Louis, MO on September 28-30, 2017 at the Peabody Opera House. To submit your CfP, visit http://thestrangeloop.com/.PWLConf 2017 will be taking place September 28th in St. Louis, MO, before Strange Loop. Visit http://pwlconf.org/ for more information and to stay updated on latest announcements.Open FSharp will be taking place the 28th-29th of September in San Francisco, California. Visit openfsharp.org for more information and to register.RacketCon is October 7th & 8th at the University of Washington, with keynote speakers Dan Friedman and Will Byrd. Visit http://con.racket-lang.org/ for more information and to register.LambdaWorld will be taking place in Cadiz, Spain on October 26th and 27th. For more information visit and to keep updated visit http://www.lambda.world/.CodeMesh is coming up November 8th and 9th in London. For more information, and to keep an eye open for registration, visit http://www.codemesh.io/.If you have a conference related to functional programming, contact me, and I will be happy to announce it.AnnouncementsSome of you have asked how you can support Functional Geekery, in that vein,Functional Geekery now has a Patreon Page.If that is one of the ways you would like to show your support, you canfind out more at https://www.patreon.com/fngeekery.Topics [@About ScottScott on Functional Geekery Episode 66Scott on Three Devs and a MaybeProgramming Like Functions Matter with Jimmy Burrell and Scott WlaschinThe Tale of State and Behaviour, Part 1 with Scott WlaschinThe Tale of State and Behaviour, Part 2 with Scott WlaschinScott’s upcoming book Domain Modeling Made FunctionalHow the book came aboutF#Using F# for Business Domain modelingBalancing the formalistic mathematical side with the humanistic side of softwareBuilding the thing right vs building the right thingDomain-Driven DesignF#’s ability to evolve software while keeping aligned to the domainAbility to lean on the compiler more in ML family languagesEase, simplicity, and conciseness of adding new domain typesDomain types as concepts separated from their underlying serialization formatBenefit of immutable data in the domainAbility to focus on domain logic and not defensive programmingEvolving type definitions as the domain logic evolvesRefactoring transformations vs state mutation changesAbstraction vs Concretion in modeling the domainSum/Product Types vs Generic Types in modeling the domainAbility to model against types without knowing what the types actually areMonoid – ability to combine two types to make a larger type“The principles don’t change”Getting more people to talk about integrating Domain Driven Design and functional programmingTrying to organize the narrative of a bookOverview of what the book’s audience and organization will be“I wanted to make something approachable”Demystifying functional programmingShowing people with the focus on practical things over academic thingsLessons learned on not building the right thingOutline of Scott’s bookOrder processing system as example domainThirteen ways of looking at a turtleUpcoming appearancesNDC OsloNDC SydneyOpen FSharp conferenceNDC Conferences’ videos on VimeoAs always, a giant Thank You goes to David Belcher for the logo design.