Notes on software and the ideas behind it

Find the meaning
behind the code.

I’m Fred Yang. I write about software—how it works, why it behaves the way it does, and the ideas that make code easier to reason about.

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Working notes / 2026

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Architecture, reactivity, and the hidden relationships that shape frontend systems.

Entity Framework

Entity Framework Inheritance

using (SchoolDataEntities1 store = new SchoolDataEntities1()) {
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Unit Test

Convert to Arrange, Action, Assert

I am studying RhinoMocks, the new Arrange/Action/Assert style is more concise than the Record/Replay. Compare the style below
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Software Design

Persistence Ignorance and ORM

The purpose Of Persistence Ignorance is to keep your domain model decoupled from your persistence layer. Nilsson establishes the following characteristics as things you should not have to do in persistence ignorance <h1> Inherit...
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Software Design

Another Notes of DDD

Entity <p> Real word entity is an independent, seperate, or self-contained existence. It's identity is what gives it uniqueness and differentiates it from other thing else. This is typically a set of characteristics or...
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Software Design

Notes for Domain Driven Design Quickly

What is domain driven design? <p> The best way to do it is to make software a reflection of the domain. Software needs to incorporate the core concepts and elements of the domain, and...
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