swlaschin

A response to http://ayende.com/blog/170849/why-ravendb-isnt-written-in-f-or-the-cost-of-the-esoteric-choice

Why my F# projects don't use RavenDB, or the cost of the esoteric choice

As you know, I generally recommend using SqlServer for data storage.

But many people have suggested that using RavenDB rather than SqlServer would dramatically reduce the development effort.

My reply to that was that using RavenDB would also lead to a lot more complexity, reduced support by other teams, harder to find DBAs and increased costs all around.

ThatRendle

Update, September 2016

OK, you can pretty much ignore what I wrote below this update, because it doesn't really apply anymore.

I wrote this over a year ago, and at the time I had spent a couple of weeks trying to get Kafka 0.8 working with .NET and then Node.js with much frustration and very little success. I was rather angry. It keeps getting linked, though, and just popped up on Hacker News, so here's sort of an update, although I haven't used Kafka at all this year so I don't really have any new information.

In the end, we managed to get things working with a Node.js client, although we continued to have problems, both with our code and with managing a Kafka/Zookeeper cluster generally. What made it worse was that I did not then, and do not now, believe that Kafka was the correct solution for that particular problem at that particular company. What they were trying to achieve could have been done more simply with any number of other messaging systems, with a subscriber reading messages off and writing

rianhunter

/*
  This benchmark shows how indirect function calls have nearly
  the same overhead costs as direct function calls.
  
  This is comparing apples to apples, factoring out the savings
  due to inlining optimizations that direct calls usually afford.
    
  From this, it seems that inlining and other generic interprocedual
  optimizations are the main drivers of direct function call optimization,
  not the direct call itself.

paulirish

/* bling.js */
window.$ = document.querySelector.bind(document);
window.$$ = document.querySelectorAll.bind(document);
Node.prototype.on = window.on = function(name, fn) { this.addEventListener(name, fn); };
NodeList.prototype.__proto__ = Array.prototype;
NodeList.prototype.on = function(name, fn) { this.forEach((elem) => elem.on(name, fn)); };

thure

Fundamentals: why state machines?

States. The final frontier. These are the voyages of an enterprising developer. Her eternal mission: to explore strange new techniques, to seek out better ways to engineer for mental models and new design patterns. To boldly go where a few awesome devs have gone before.

So you’ve found our poignant guide to SCXML and surely you’re wondering “Why should I want to go out of my way to use formal state machines?” or something like that. Hopefully this introduction addresses that kind of question.

An example: Nancy’s RPG

The problem

jkeirstead

akras14

Git Cheat Sheet

Commands

Getting Started

git init

or

hadley

I think the two most important messages that people can get from a short course are:

a) the material is important and worthwhile to learn (even if it's challenging), and b) it's possible to learn it!

For those reasons, I usually start by diving as quickly as possible into visualisation. I think it's a bad idea to start by explicitly teaching programming concepts (like data structures), because the pay off isn't obvious. If you start with visualisation, the pay off is really obvious and people are more motivated to push past any initial teething problems. In stat405, I used to start with some very basic templates that got people up and running with scatterplots and histograms - they wouldn't necessary understand the code, but they'd know which bits could be varied for different effects.

Apart from visualisation, I think the two most important topics to cover are tidy data (i.e. http://www.jstatsoft.org/v59/i10/ + tidyr) and data manipulation (dplyr). These are both important for when people go off and apply

candidtim

# This code is an example for a tutorial on Ubuntu Unity/Gnome AppIndicators:
# http://candidtim.github.io/appindicator/2014/09/13/ubuntu-appindicator-step-by-step.html

import os
import signal
import json

from urllib2 import Request, urlopen, URLError

from gi.repository import Gtk as gtk

dharmatech

The problem to solve

An example problem from the textbook Physics for Scientists and Engineers by Serway and Jewett:

Let's solve this using Symbolism, a C# library for computer algebra and symbolic computation.

Symbol definitions