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# Lev Gorodinski eulerfx

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(); SwapByteOrder(_namespaceBytes);
Last active Jan 15, 2020
A bijection between numbers and pairs of numbers.
View Bijection.md

## 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)
``````
Last active Feb 13, 2018
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] {
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]{http://www.infoq.com/minibooks/domain-driven-design-quickly}. During the day watch following great videos (in this order):

1. Eric Evans' [What I've learned about DDD since the book]{http://www.infoq.com/presentations/ddd-eric-evans}
2. Eric Evans' [Strategic Design - Responsibility Traps]{http://www.infoq.com/presentations/design-strategic-eric-evans}
3. Udi Dahan's [Avoid a Failed SOA: Business & Autonomous Components to the Rescue]{http://www.infoq.com/presentations/SOA-Business-Autonomous-Components}
4. Udi Dahan's [Command-Query Responsibility Segregation]{http://www.infoq.com/presentations/Command-Query-Responsibility-Segregation}
5. Greg Young's [Unshackle Your Domain]{http://www.infoq.com/presentations/greg-young-unshackle-qcon08}
6. Eric Evans' [Acknowledging CAP at the Root -- in the Domain Model]{ht
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(); DependencyResolver.SetResolver(resolver); DataAnnotationsModelValidatorProvider.RegisterDefaultAdapterFactory(
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" } ]