Eyas's Blog

Occasional musings on software development, tech, the Middle East, and anything else.

Typescript Archives

In Search of Better Loading and Error-handling in Angular

For many, Reactive programming seems like a conceptually elegant approach that falls apart the moment you try to do any serious programming. When adding essential error handling, refreshable state, etc. into an application, many folks see their codebases move further from the promise of clean, elegant reactive transforms. It doesn't have to be this way. While I've argued before for cleaner display…

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Unexpected Lessons from 100% Test Coverage

The conventional wisdom of the software engineering community is that striving to 100% test coverage is a fool's errand. It won't necessarily help you catch all bugs, and it might lead you down questionable paths when writing your code. My recent attempts at 100% test coverage showed me the answer is much more subtle. At times I was tempted to make questionable code changes just for the sake of…

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Learning by Implementing: Observables

Sometimes, the best way to learn a new concept is to try to implement it. With my journey with reactive programming, my attempts at implementing Observables were key to to my ability to intuit how to best use them. In this post, we'll be trying various strategies of implementing an Observable and see if we can make get to working solution. I'll be using TypeScript and working to implement…

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Schema.org Classes in TypeScript: Properties and Special Cases

In our quest to model Schema.org classes in TypeScript, we've so far managed to model the type hierarchy , scalar DataType values , and enums . The big piece that remains, however, is representing what's actually inside of the class: it's properties. After all, what it means for a JSON-LD literal to have "@type" equal to "Person" is that certain properties — e.g. "birthPlace" or…

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Schema.org DataType in TypeScript: Structural Typing Doesn't Cut It

Schema.org has a concept of a DataType , things like Text , Number , Date , etc. In JSON-LD, we represent these as strings or numbers, rather than array or object literals. This data could describe the name of a Person , a check-in date and time for a LodgingReservation , a URL of a Corporation , publication date of an Article , etc. As we'll see, the Schema.org DataType hierarchy is far…

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