The createArticle method returns a “maybe” Article type. The eeze() method freezes an object: that is, prevents new properties from being added to it. Each new article will have a unique autogenerated id and zero likes, letting us supply only the author and title. The createArticle method will allow us to create frozen objects of type Article. Since we need only one articleService in our application, we will export it as a singleton. Now let’s create the articleService using the factory function pattern.Ĭheck out this video by for a great explanation.
Angular, React, Vue, it shouldn’t matter, we should be able to use our domain regardless of the framework we choose. It represents the core of our application and should be agnostic to the view layer. The domain describes the state and holds the business logic. A change will always result in a new object so we only need to check if the reference to the object has changed.
Immutability makes tracking changes cheap. Here is a quote from React’s guide to optimizing performance: Immutable architecture has many benefits, one being at the view level. The state will consist of immutable objects. You visit an URL, that’s state, make an Ajax call to retrieve a list of movies, that’s state again, you persist info to local storage, ditto, state. The state represents every piece of data that changes in an application. Extend the template language with your own components … įrameworks help us build apps consisting of views.
#Page layers app update
Now let’s check a part of React’s definition:ĭesign simple views for each state in your application, and React will efficiently update and render just the right components when your data changes … īuild features quickly with simple, declarative templates.
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