Category: Software development

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Go interfaces and type assertions

In this blog I would like to zoom in on Interfaces and type assertions in Go. Compared to language like c# and Java implementing interfaces works slightly different. In the remainder of this blog I want to give you a bit of theory and practical usecases. In case this is your first time working with Go you might want to check out this blog which shows you how to setup your development environment including a small hello world.

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Concurrency in Go

A reason to choose Go over other programming languages could be to have the need for building software which requires concurrency. Go is built with concurrency in mind. You can achieve concurrency in

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The use of defer in Go

In my previous blog post I have covered how to setup your development environment for Golang including a simple hello world. In case this is your first Go project please have a look on this blog post

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Start on your first Golang project

A couple of months ago I started to do some coding in Go a.k.a Golang. Not only because they have an awesome logo ;-). My main reason was because I wanted to have something running as bare metal as possible on my Raspberry Pi and I wanted to have it available for different platforms to be easy to install. Some other reasons are the ease of creating async code by using Go in front of your methods and the unique approach of channels to sync between go routines (threads). I have been reading a lot about Go since it was released in 2012, now it was time to really get my hands dirty and try it for myself. Curious, continue reading…

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Jasmine vs. Mocha

In this blog post I want to highlight the similarities and the differences between Jasmine and Mocha. In this comparison I will focus on the latest versions of both libraries. As of this writing Jasm

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Using Gulp.js to check your code quality

In this blog post I want to show you how you can use Gulp.js to automate some tasks to check the quality of your code. Before we deep dive into the subject and the coding examples I first want togive you a short introduction on what Gulp.js actually is. So if you already know what Gulp.js is about you can move on to the next chapter. Easy to useBy preferring code over configuration, gulp keeps things simple and makes complex tasks manageable.EfficientUsing the power of node streams, gulp gives you fast builds that don’t write intermediary files to disk.Previous statements are quoted from the Gulp.js homepage. Gulp.js is just like Grunt.js a task runner build on Node.js aka io.js. Where you define your tasks in Grunt.js in a configuration based style, you will be defining your tasks in Gulp.js more in a code based style. For both task runner there is a wide variety of plugins available. So what is the real power of Gulp.js? In my opinion that is the utilization of the Node.js streams, which makes Gulp.js a very fast and memory efficient task runner. The difference between Gulp.js and Grunt.js can especially be noticed when working on larger projects, with huge amounts of files. In many cases developers are limiting the usage of both task runners to only their javascript projects. As I showed you last time Grunt.js can also be used to automate some of your .Net/c# tasks I want to show you today you can also use it on php projects. So here is my call for action. Stop limiting yourself and try to apply it on any project you’re working on, no matter the language!

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Using Mocha Chai Sinon to test Node.js

In this article I’m going to show you how to write tests for your NodeJS application using Mocha, Chai and Sinon. Mocha is a feature-rich JavaScript test framework running on node.js and the browser, making asynchronous testing simple and fun. Mocha tests run serially, allowing for flexible and accurate reporting, while mapping uncaught exceptions to the correct test cases. One of the cool things is you can choose your own assertion style when writing Mocha tests. In this article I will use Chai to do my assertions. Chai is a BDD / TDD assertion library for node and the browser that can be delightfully paired with any JavaScript testing framework. Chai supports 3 assertion styles. Should, expect and assert. This makes Mocha and Chai the ultimate combination to make your testing suite completely fit your own project needs and desires. As a mocking framework I choose Sinon since it integrates neatly with Mocha and Chai and dozens of other test frameworks. Standalone test spies, stubs and mocks for JavaScript. No dependencies, works with any unit testing framework. In order to start with writing your tests we first need to install Mocha, Chai and Sinon. Since I use Mocha for multiple projects I choose to install Mocha globally. 12npm install -g mochanpm install --save-dev mocha chai sinon To be sure the consumers of my node package also have mocha installed I also add it to the dev dependencies. Since I installed Mocha globally it won’t be installed in my package folder again. Now we can actually start writing our tests.

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Automate your development tasks using Grunt

Grunt is an extremely useful Node.js package to automate lots of development and continuous integration tasks. The Grunt eco-system has lots of packages available on npm. This enables us to quickly setup our development/continuous integration environment. Grunt tasks mostly have two required properties. An files array, which is used to configure on what files the tasks is executed, and an options property which configures some task specific settings. The files array supports the globbing and minimatch pattern to match files based on the provided expression. So what tasks could you use for your projects, or for which project can you use Grunt? How do I configure Grunt tasks? How do I execute them? All these questions I try to answer for you in this article.

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npm tips and tricks

In my previous post I showed you how easily you can create a simple webserver using Node.js. In this post I want to show you how to make more advanced usage of node package manager. npm initUsing node package manager you can get an even quicker start of your project by using the npm init command. So let’s get started by opening a command prompt (on windows open the Node.js command prompt). Then create a new folder and navigate into this newly created folder. In the folder execute following command and answer the questions or press enter for the defaults.

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Starting with a Node.js webserver

Before starting to explain how you start your first Node.js project for building a simple web server I will first explain you what Node.js is. To do so I just include a quote of the Node.js themself, because I don’t like to reinvent the wheel. Node.js is a platform built on Chrome’s JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices. The next thing you should know is about the Node.js Package Manager (NPM). Using NPM you can benefit from the thousands of open source packages so you won’t have to build everything yourself. I suppose you already have installed Node.js. Let’s start with a simple Hello World in Node.js by creating a file called hello-world.js and execute our script to show the result. hello-world.js1console.log('Hello World'); We can execute the script using following command. (On Windows open the Node.js command prompt) Navigate to your folder containing the just created hello-world.js file and execute the script using node. 123456Your environment has been set up for using Node.js 4.1.1 (x64) and npm.Press any key to continue . . .C:\Users\Marco> cd MyHelloWorldCodeFolderC:\Users\Marco\MyHelloWorldCodeFolder> node hello-world.jsHello World

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CI with Jenkins, MSBuild, Nuget and Git part 4

In part 1, 2 and 3 I showed you how to create a simple MSBuild script and how to execute it from the command line. We had a look at how to clean your output directories, download the Nuget packages, compile your code, run MSpec tests and creating a code coverage report. In this last part of this series I will show you how to integrate it with Jenkins. First of all we want Jenkins to pull the latest code from Github as soon as somebody has pushed new code to Github. To do this we need to install the Github plugin in Jenkins. We will also install the “MSBuild plugin” in Jenkins to be able to use MSBuild in Jenkins and the “Html publisher plugin” to publish the Coverage and MSpec reports. Also install the “Jenkins Git plugin” to configure the repository in Jenkins.

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CI with Jenkins, MSBuild, Nuget and Git part 3

In the previous parts (part 1, part 2) of this series I described how to clean, download Nuget packages and build your solution using MSBuild. In this part I will explain you how to create a MSpec MSBuild target and a Code coverage MSBuild target. MSpec is a testing framework which enables you to write living specifications. Using the MSpec console runner you can easily generate an html report. This report can later on be published using the Jenkins report plugin. By publishing this report we have some documentation on the specifications of the software available and because we did write the specifications using MSpec we also have unit tests in place. So that’s why I call it living documentation. :D For generating the code coverage report we use the xml output of our MSpec tests. These reports will also be published using the Jenkins report plugin. To do so I use OpenCover and ReportGenerator. All three packages are installed in my solution using Nuget. So the paths in my build script are based on the paths of my source/packages folders.

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CI with Jenkins, MSBuild, Nuget and Git part 2

In part 1 of this blog series we had a look at a very basic MSBuild script which enables us to compile our projects. For doing this I provided you guys with a simple batch file to make it even more simple to execute the build script. In this episode we will focus on cleaning the folders before building again and getting the Nuget packages using Nuget package restore. The latter I will explain further for you first. Nuget package restore can be enabled in Visual studio. A best practice is to enable this always, because then we won’t have to put all Nuget packages in source control. By enabling it, every team member will download the missing packages automatically when building his project in Visual Studio. However the build server won’t do this by default so we create a custom target in our build script to make this happen.

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CI with Jenkins, MSBuild, Nuget and Git part 1

Very lately I have worked on setting up some continuous integration (CI) using MSbuild for my c# project. In this blog series I will explain to you how to set up continuous integration. First of all we will start with creating a MSBuild script which will compile our code. We will also create a small batch file for easy executing the MSbuild script. When that is in place, we will add several targets to the build script to run for example unit tests, integration tests, code coverage, packaging etc. So we will take the agile approach and improve our build process based on validated learning. First of all we need some basic knowledge about MSbuild. I think there are enough pages around on the web which will give you a basic introduction. A good starting point would be the MSDN documentation for MSBuild. Let’s consider we have the following project structure within our Git repository / local file system. src (contains our source code) lib (contains build output, and third party libs not available on nuget) reports (contains code coverage reports, test scenarios and test results) ci.msbuild (your msbuildfile) ci.msbuild.cmd (your batch file to execute the build on your local machine)

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Recap my online year 2012

The year 2012 was for me a year that went way to fast. In the year 2012 I learned a lot new stuff, wrote several blog posts and read lots of blog posts and articles. First of all I want you to give a list of all blog posts I wrote this year. You can find the complete list here http://marcofranssen.nl/2012/ and here http://marcofranssen.nl/2012/page/2/. JavaScript http://marcofranssen.nl/writing-modular-javascript-without-polluting-the-global-namespace/ http://marcofranssen.nl/knockout-js-mappings/ Windows 8 http://marcofranssen.nl/install-windows-8-consumer-preview-on-vhd/ http://marcofranssen.nl/install-windows-8-from-rusty-256-mb-usb-stick/ Windows Phone http://marcofranssen.nl/minesweeper-7/ http://marcofranssen.nl/shortify-for-windows-phone-7/ http://marcofranssen.nl/sokoban-7/ http://marcofranssen.nl/windows-phone-theme-colors/ ASP.NET MVC http://marcofranssen.nl/secure-your-web-app-fluently/ .NET C#  http://marcofranssen.nl/delegate-your-equality-comparisons/ Powershell http://marcofranssen.nl/unblock-downloaded-files-with-powershell/ I even wrote a non-technical article http://marcofranssen.nl/pitching-equals-invisible-convincing/ Second I want to share my starred articles from my reading archive. I used pocket to bookmark, read and archive my articles, which enables me now to share all starred articles with you.