Simple Ionic 2 TODO App

 
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This is a small todo app to demonstrate how to separate application logic and business rules from Ionic 2 as a framework. Almost all the logic is in a directory called core with no outside dependencies.

See Ionic 2 Todo app on GitHub.

Ionic 2 interacts with the core app through a single point of entry, the ItemController.

For a todo app, this example might be a bit over-engineered, but it serves as a starting point for a more complex app I’m developing.

Please read my other post Towards A Clean Architecture for Ionic 2 Apps to understand what I’m trying to achieve.

The app is extremely light on UI stuff. There’s basically a Timer that triggers a dummy interaction after 3 and 5 seconds. But that’s not the point of the project.

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Towards A Clean Architecture for Ionic 2 Apps

 
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I have one requirement for my new Ionic 2 app: The core needs to work without Ionic 2. It will be released as native apps for Android and iOS, but also as a Single-Page-App (SPA).

Ionic 2 is optimized for iOS and Android and not made for Web apps. Thus, I need to separate as much logic as possible from Ionic 2 and create a core application that can be interacted with through an Ionic 2 layer or an SPA.

This requirement forces me to think about a clean architecture when writing Ionic 2 apps.

I haven’t found the perfect solution yet, but stumbled across a few interesting ideas, concepts and articles that I want to share with you.

Even if you won’t make a Web-app, I hope you can take a few ideas from this post.

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Hybrid app development is complicated

 
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The other day I read on Hacker News something like:

I wanted to get into Web Development. Is it really that ugly, hard, and annoying?

I thought: What’s the problem? It ain’t that bad, but to be honest, it really is quite difficult.

Web development in 2016 means: Doing a lot of JavaScript. Setting up your JavaScript stack takes time and knowledge and sure, you can get away with a bit of jQuery and Vanilla JS.

Since I decided to make the new version of my app entirely hybrid, I’m intrigued by Ionic 2, Angular 2 and TypeScript.

Sure, you can punch out a stupid small app in no time with Ionic 2, but something with a bit more complexity requires a few more brain cycles. Obviously, my new app has to be maintainable, needs sync across devices, I want a web UI in addition to the mobile apps and all of a sudden, I find myself in the same mess as the guy who asked on Hacker News.

Doing a hybrid mobile app in 2016 means to learn:

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