Skip to main content

Learn by doing: Linq koans

You want to learn Linq, or increase your knowledge about it. Let’s introduce Linq koans. It allows you to learn LINQ by doing. Based on unit tests, you scroll down the class, fixing each test.(You have to replace the ‘___’ with the correct value.

Koans allow you to 'try out' aspects of a language while working in the language. In these koans, you just download the project, unzip it and open it in VS2010. Work with source the files in the following order:

1) LinqSynax.cs

2) LinqLambdaSyntax.cs

3) ExtendedLinqLamdbaSyntax.cs

As you change the blank (variable) to the correct answer and get the tests to pass, be sure to ask yourself after you get a green bar for each method, 'What did I just learn?'

A sample test:

[TestMethod]
public void LinqResults()
{
Microwavable result = (from x in ObjectsInMicrowave
where x.Name == "Ping Pong Ball"
select x).First();
Assert.AreEqual(___, result.Name);
}

Popular posts from this blog

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Color B

Help! I accidently enabled HSTS–on localhost

I ran into an issue after accidently enabling HSTS for a website on localhost. This was not an issue for the original website that was running in IIS and had a certificate configured. But when I tried to run an Angular app a little bit later on http://localhost:4200 the browser redirected me immediately to https://localhost . Whoops! That was not what I wanted in this case. To fix it, you need to go the network settings of your browser, there are available at: chrome://net-internals/#hsts edge://net-internals/#hsts brave://net-internals/#hsts Enter ‘localhost’ in the domain textbox under the Delete domain security policies section and hit Delete . That should do the trick…

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.