Base application using nest JS focused on DDD architecture and SOLID principles - pezzetti/base-app-nestjs Dependency Inversion Principle (DIP) It doesn’t care where the movies are gotten from, whether from the store, localStorage, or a dummy server/dummy data, etc. This component causes a side effect by performing an HTTP request. This service deals with any CRUD operations on our movies API. Learn the best practices of how to write clean code in JS. Side effects can occur when the app state changes from a certain point of reference. The separation of concerns is keeping the code for each of these concerns separated. However, now another problem arises, how do we know that the object passed into the areaCalculator is actually a shape or if the shape has a method named area ? It states that functions and classes should only have one job. First, we'll start by exploring the reasons they came about and why we should consider themwhen designing software. Let’s say, for example, we have an app that lists movies from an endpoint: This is bad for business. Since JavaScript doesn’t have interfaces, I’m going to show you, how this will be achieved in TypeScript, since TypeScript models the classic OOP for JavaScript, and the difference with pure JavaScript Prototypal OO. This principle allows for decoupling. I’ve found a very good article explaining the S.O.L.I.D. Effects relieve our components of numerous responsibilities. — we must rewrite the code in each component, even though they’re the same. In this tutorial, we’ll focus on the single-responsibility principle and demonstrate how it can help guide your design decisions in JavaScript frameworks, especially Angular and React. Single Responsibility Principle. Next, we move on by creating the areaCalculator factory function and then write up our logic to sum up the area of all provided shapes. If we forget to do this, that application may break in unpredictable ways. This is because we’re removing a movie from the movies array so the component should rerender to reflect the remaining array. First we create shapeInterface factory function, as we are talking about interfaces, our shapeInterface will be as abstracted as an interface, using function composition, for deep explanation of composition see this great video. Dumb components can be optimized because they are predictable; they output what they are given and their graph is linear. The function would still do one huge thin… The callback function in the useEffect hook is called whenever the component mounts/updates/unmounts. Here, we separated the multiple concerns in the MoviesComponent. Many store-based applications incorporate the RxJS-powered side effect model. The single responsibility principle in JavaScript deals with the cohesiveness of modules. There will be breaking changes if one part changes. We need to refactor our example component to push some responsibilities to other components. What the manageShapeInterface factory function receives as the argument is a higher order function, that decouples for every shape the functionality to accomplish the needed logic to get to final calculation, let see how this is done in the shapes objects. The same thing should be done for the circle factory function, an area method should be added. And we have made it before, lets review our code with the manageShapeInterface and how we accomplish the calculate method. Robert C Martin has promoted SOLID Principles and now it’s very famous. The invention of SOLID principles began in the late 80s. Adopting these practices can also contribute to avoiding code smells, refactoring code, and Agile or Adaptive software development. Primary benefits. Like in our MoviesComponent, it injected the MoviesService to perform CRUD operations on the movies API. Side effects can lead to stale data or inaccurate data in React. You may have heard the quote: “Do one thing and do it well”. This refers to the single responsibility principle. If the MoviesService class makes a breaking change, it may affect our MoviesComponent. LogRocket records console logs, page load times, stacktraces, slow network requests/responses with headers + bodies, browser metadata, and custom logs. This might sound bloated, but it is really easy to understand. The MoviesList component is the presentational component. This one is easy to comprehend but harder to implement. Here, when we talk about a responsibility, we mean a reason to change. The single responsibility principle helps ensure that we write clean and reusable code. Open Closed Principle (OCP) 3. If a class has more than one responsibility, the responsibilities become coupled. If the previous value of movies is: The component needs to rerender to reflect the new changes. As you can see, this principle states that an object / class should only have one responsibility and that it should be completely encapsulated by the class. Instead it opts to compile its templates down to real DOM nodes and wrap updates in fine grained reactions. If you don’t know what a higher order function is you can go and check this video. In this tutorial, we'll be discussing the SOLID principles of Object-Oriented Design. In simpler words, means that a class or factory function in our case, should be easily extendable without modifying the class or function itself. Very similar to Unix’s “Do one thing and do it well”.

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