CategoryC#

Our journey to F#: C#-F# Interop

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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...

Using System.Text.Json alongside Newtonsoft Json.Net

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Fast car

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...

Our journey to F#: The effect of F# on our (unit) tests

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On our journey from C# to F#, we were at a point where we changed our (unit) testing strategy. Our approach just didn’t feel right anymore. We struggled to do TDD because we didn’t get the tests to fail first. We wrote tests that didn’t increase our confidence and started thinking of them as waste.

This post is part of the F# Advent Calendar 2021 
Thanks to Sergey Tihon for organising the Advent Calendar.

Our journey to F#: JSON serialization with a mix of C# and F#

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There are many libraries for JSON serialization in the .Net realm. The best known are probably Newtonsoft’s Json.NET and System.Text.Json. Both can’t handle F# discriminated unions very well. There are also a couple of F# JSON libraries available like Thoth.Json or FSharp.Json. They are all great libraries, and choosing one is about making trade-offs. However, our case is a bit complicated because we have a mix of C# and F# code. This results in object/value graphs that consist of a...

Type-safety across .Net and TypeScript – Angular Services from WebApi Controllers

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This is part 5 of how we generate types from our .Net backend to be used in our TypeScript client. Why do we even bother?Generating TypeScript constants from .Net constantsFinding the types used in communication between the .Net backend and the TypeScript clientGenerating TypeScript classes from .Net typesGenerating Angular Services from .Net WebApi ControllersTypeScript-friendly JSON serialization of F# typesTesting JSON serialization and deserializationPutting all the parts together...

Type-safety across .Net and TypeScript – Generating TypeScript classes

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This is part 4 of how we generate types from our .Net backend to be used in our TypeScript client. Why do we even bother?Generating TypeScript constants from .Net constantsFinding the types used in communication between the .Net backend and the TypeScript clientGenerating TypeScript classes from .Net typesGenerating Angular Services from .Net WebApi ControllersTypeScript-friendly JSON serialization of F# typesTesting JSON serialization and deserializationPutting all the parts together Be...

Type-safety across .Net and TypeScript – Finding the types

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This is part 3 of how we generate types from our .Net backend to be used in our TypeScript client. Why do we even bother?Generating TypeScript constants from .Net constantsFinding the types used in communication between the .Net backend and the TypeScript clientGenerating TypeScript classes from .Net typesGenerating Angular Services from .Net WebApi ControllersTypeScript-friendly JSON serialization of F# typesTesting JSON serialization and deserializationPutting all the parts together Be...

Type-safety across .Net and TypeScript – Constants

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This is part 2 of the series about how we generate code from .Net for TypeScript:

Why do we even bother?Generating TypeScript constants from .Net constantsFinding the types used in communication between the .Net backend and the TypeScript clientGenerating TypeScript classes from .Net typesGenerating Angular Services from .Net WebApi ControllersTypeScript-friendly JSON serialization of F# typesTesting JSON serialization and deserializationPutting all the parts together

Type-safety across .Net and TypeScript – Why?

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A little while ago, I asked on Twitter whether someone would be interested in reading about how we generate types from our .Net backend to be used in our TypeScript client. So, here we are. I’ll cover the following topics: Why do we even bother?Generating TypeScript constants from .Net constantsFinding the types used in communication between the .Net backend and the TypeScript clientGenerating TypeScript classes from .Net typesGenerating Angular Services from .Net WebApi...

C# vs. F#

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I dared to ask two questions on twitter:

What makes your daily developer life easier in F# compared to C#?What is better in C# than F#?

This post summarizes the answers and my own opinion on where C# and F# shine.

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