Today’s random F# code from our app is about using Results instead of using exceptions.
Do you often need to get some data from the database, but it’s not sure that the requested data exists? And you don’t like using exceptions for this because exceptions are for really unusual things? Then use a Result:
Querying data with the help of Result
Today’s random F# code from our app is about validating data passed to us over our public API:
Example code showing the usage of FsToolkit.ErrorHandling’s validation computation expression.
C# indeed gets more and more features known to F#, like pattern matching, switch expressions, records, a way to deal with nulls, and someday maybe even discriminate unions and deep equality on collections. Maybe even type inference could become as powerful as in F#. However, C# can’t eliminate the features it already has, like mutability by default and statements. Immutability by default and expressions-only are strengths of F# and make building error-free apps easier. Real pipes and...
Today’s random F# code is about type inference. If you like var, default and new() in C#, you might like F# a lot because F# gives you type inference also for function parameters, return types and generics (grey = IDE showing the inferred function signature):
F# type inference examples
When we started with TimeRocket in 2015, we used C# as the programming language for our backend. In 2020, we started using F# for our new code. We see little value in rewriting existing C# code to F# and do so only when major changes are due in existing C# code. As a result, we have quite a bit of C#-F# interop in our system. Both from C# to F# and from F# to C#. This post overviews what we learned about C#-F# interop. This blog post is part of the F# Advent Calendar 2022 – check out the...
In June, I was contacted by BenQ Lightning about whether I was interested in giving their ScreenBar a try. I was, so this is my experience with this interesting desktop light. It was not what I was expecting!
In June 2019, Microsoft introduced System.Text.Json as a feature of .NET (core) 3.0 to the public. The reason they gave for creating this new namespace was that they were unhappy with the old built-in solution for serializing / deserializing JSON. The poor built-in capabilities to work with JSONs –of course- was the reason for James Newton-King to create Json.Net (for many of us just called Newtonsoft, which actually is his company and not the name of the library). Newtonsoft’s Json.Net...
Today I learned something insanely useful for working with ngForm in Angular:ControlContainer!
A couple of weeks ago, one of my colleagues was tasked with implementing multiple customizable reports for our software. So, he did some research and found ActiveReportsJS by Grapecity. It allows us to create templates for reports, which could then be edited by our users to fully customize the appearance of those reports. Not only that, but it allows for PDF previewing on the one hand and headless exporting the PDFs on the other. To my surprise, the PDF rendering takes place in the...
Time to look back at 2021 and what interested you the most on planetgeek.ch. These are the top 10 most viewed blog posts – views in 2021: