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jen20 / MessageIdentity.cs
Created Aug 19, 2014
Generator for deterministic GUIDs
View MessageIdentity.cs
public class MessageIdentity
public Guid NameSpace;
private readonly byte[] _namespaceBytes;
public MessageIdentity(Guid guidNameSpace)
NameSpace = guidNameSpace;
_namespaceBytes = guidNameSpace.ToByteArray();
andrejbauer /
Last active Jan 15, 2020
A bijection between numbers and pairs of numbers.

A bijection between numbers and pairs of numbers

Every once in a while I am faced with someone who denies that the rational numbers (or fractions, or pairs of integers) can be put into a bijective correspondence with natural numbers. To deal with the situation, I coded up the bijection. So now I can just say: "Really? Interesting. Please provide a pair of numbers (i,j) which is not enumerated by f, as defined in my gist." I am still waiting for a valid counter-example.

Anyhow, here is a demo of f and g at work. I am using the Python version, but a Haskell variant is included as well.

The 100-th pair is:

>>> f(100)
(10, 4)
View gist:10045379
import scalaz._
// A right Kan extension of `F` along itself, constrained by `C`.
trait RCodensity[C[_], F[_], A] {
def apply[R:C](k: A => F[R]): F[R]
object RCodensity {
implicit def codensityMonad[C[_], F[_]]: Monad[({type f[x] = RCodensity[C,F,x]})#f] =
new Monad[({type f[x] = RCodensity[C,F,x]})#f] {
SzymonPobiega / gist:5220595
Last active Jul 29, 2021
DDD/CQRS/ES/Architecture videos
View gist:5220595

If you have two days to learn the very basics of modelling, Domain-Driven Design, CQRS and Event Sourcing, here's what you should do:

In the evenings read the [Domain-Driven Design Quickly Minibook]{}. During the day watch following great videos (in this order):

  1. Eric Evans' [What I've learned about DDD since the book]{}
  2. Eric Evans' [Strategic Design - Responsibility Traps]{}
  3. Udi Dahan's [Avoid a Failed SOA: Business & Autonomous Components to the Rescue]{}
  4. Udi Dahan's [Command-Query Responsibility Segregation]{}
  5. Greg Young's [Unshackle Your Domain]{}
  6. Eric Evans' [Acknowledging CAP at the Root -- in the Domain Model]{ht
tugberkugurlu / gist:3848723
Created Oct 7, 2012 — forked from benfoster/gist:3848715
Adding IServiceProvider to ValidationContext in ASP.NET MVC
View gist:3848723
public class MvcApplication : System.Web.HttpApplication
protected void Application_Start()
/* usual sh** ommitted for brevity */
var resolver = new CustomDependencyResolver();
coldnebo / Default (Linux).sublime-keymap
Created Aug 10, 2011
simple scripts to prettify your xml and json in sublime text 2
View Default (Linux).sublime-keymap
{ "keys": ["ctrl+shift+x"], "command": "tidy_xml" },
{ "keys": ["ctrl+shift+j"], "command": "prettify_json" }