reidev275

Learning a new paradigm is one of the more difficult things to do in software development.
So why would an object oriented developer of 10 years suddenly decide to make the drastic switch to functional programming? 
In this talk I'll show you why I started looking for other ways of writing software and why the switch wasn't as sudden or as drastic as it may seem. 

We'll start our journey with C#, discussing SOLID principals and the use of IoC containers. 
Then we'll move to JavaScript to see first class functions and closures.
Next we'll visit the exciting distributed world of Elixir on the Erlang VM.
We'll finish up with F#, seeing type providers, discriminated unions, and maybe even a certain 5 letter M word.

reidev275

public class MasterPageUtils
{
	public static T Get<T>(MasterPage page) where T : class
	{
		if (page == null) return null;
		if (page is T) return page as T;
		return Get<T>(page.Master);
	}
}

reidev275

function performSearch(query, items) {
  if (query === '') return [];
  var q = query.toLowerCase();
  return items.map(function(x) {
    var lower = x.toLowerCase();
    return {
      value: x,
      matches: strategies.map(function(strategy) {
        return strategy(q, lower);
      }).filter(function(strategy) {

reidev275

select * from [entity] e
	OUTER APPLY
		(SELECT TOP 1 [status], [date]
		from [entitystatus] es (nolock)
		where es.lookupid = e.Id
		ORDER BY es.[Date] desc) as es

reidev275

// the two-track type
type Result<'TSuccess,'TFailure> = 
    | Success of 'TSuccess
    | Failure of 'TFailure

type ResultInterop<'TSuccess, 'TFailure> = {
    IsSuccess : bool
    Success : 'TSuccess
    Failure : 'TFailure
}

reidev275

let (|RegexMatch|_|) pattern input =
    let m = Regex.Match(input,pattern) 
    if (m.Success) then Some m else None

reidev275

type FlatStructure = {
    Id : int
    Description : string
    TagId : int
}

type Post = {
    Id : int
    Description : string
    Tags : seq<int>

reidev275

//DataAccess.fs
module DataAccess
    open FSharp.Data

    type Create = 
        SqlCommandProvider<
            "INSERT INTO Locations(City, State) values(@city, @state)", 
            "name=local">

    let createLocation city state =

reidev275

public static class WebApiConfig
{
	public static void Register(HttpConfiguration config)
	{
		config.Routes.MapHttpRoute(
			name: "DefaultApi",
			routeTemplate: "api/{controller}/{id}",
			defaults: new { id = RouteParameter.Optional }
		);

reidev275

public interface IPasswordHasher
{
	string GetSalt();
	string GetHash(string password, string salt);
}

public class PasswordHasher : IPasswordHasher
{
	public string GetSalt()
	{