Angular is one of the biggest frameworks that provides lots of features. It seems to be always changing and updating but in reality there are certain things that remain the same. There are some concepts that you need to learn when it comes to Angular in order to efficiently use the javascript framework. Lot of us get stuck because we don’t know where to go or what to search for. Here we came up with some concepts that you should master to be an angular developer. Let’s have a look at those important concepts.
Also know the new features of Angular 12.2 at- What’s New In Angular 12.2?
Top 10 Concepts To Master To Become Angular Developer-
1. Modular Angular Architecture-
Angular’s module architecture is unique and probably one of the hardest part for beginners to grasp. It’s most confusing concept is that we’re already using a module architecture on top of it. As angular modules add a layer of logical grouping, it is vital to keep them as much related as possible. Whereas knowing how to separate and split functionality of an application in well-defined modules is a fundamental part of architecting angular apps. There are 5 different types of Angular modules that you should be aware of:
- Service Module
- Routing Module
- Declarations/Widget Module(module that is a collection of UI components, directives and pipes)
- Domain/Feature Module
- Core/Shared Module
2. Routing-
Routing allows you to organize SPA into various virtual pages and load app’s packages on-demand. This is all because of Angualr’s lazy loading features. If you work on large app and packages exceed 1MB, you came to the importance of this. In fact no one wants to download that high amount of data to interact with your app. Routing should be used to split top-level routing and drive smaller and deeper parts of UI. It allows to split content of package into primary routes and smaller parts of app that don’t need to be downloaded on your user’s devices until they’re requested.
3. Forms And Validation-
Most CRUD applications are made up of various forms. You maybe spend more time writing forms and hence it is important to learn angular forms. Most of forms should probably be using ReactiveFormsModule module and do please ditch two-way data binding with ngModel unless you have one simple control. Angular Forms API is easy to understand and adapting it properly is important. One of the main pitfall to be aware of is that it is basically untyped. Might be it is the most annoying part so you should be very careful to ensure your forms are adhering to your data structure’s types.
With forms validation also come. Learning how validators work in conjunction with CSS will help you to speed up workflow and turn your app into error-handling ready space.
Also know the – Awesome Steps To Make Your Angular Form Reactive
4. State Management With RxJs-
State of the app determines the data that is displayed to your user. If the state is complex, chances are that your complete data structure will turn flaky and crumble against any changes. When you start to know how states work in Angular, you will be able to understand how and why your data behaves the way it is. While Angular has its own state management system, RxJs is an incredible method for centralizing states and its related data. Data can get lost in the chain of parent-child relationships. RxJs decouples this by creating a centralized store.
5. Change Detection-
Angular makes use of default change detection strategy meaning that components will always be checked. While there’s nothing wrong with using the default, it tends to be a wasteful method to detect change. For small scale apps, performance and speed are alright. But when app gets to a particular size, things can become quite heavy to run, particularly in old browsers.
onPush change detection strategy will speed up app because it depends on particular triggers to occur instead of constant check to see if anything has happened.
In order to master change detection, it is important to start with following-
- Use only observables to display data in your templates. If you’re using local state, use a BehaviorSubject
- Treat all data as immutable- using Rx, Powered State Management libraries helps in this
Mastering change detection is important and necessary step towards building extremely performant applications:
- You need to ensure to update when required
6. Separation Of Concerns Between Components, Services, And Directives-
Separating concerns looks simple in theory but harder than it seems. We’ve been instructed since the Angular.js days to keep components “lean” and services “fat”, and generally there hasn’t been a significant difference in the most current versions. Still it is important to deeply understand what exactly belongs into Components and what belongs into Services, and why Directives may only be an underrated feature.
State-
State placing is a matter of understanding whether data is accessed and shared outside of a component or whether it is local and encapsulated.
- If the state is local and used only within a component, then simply store it in a component
- If the state is shared between components, place your state in a service. It doesn’t matter what state management tool you use.
DOM Manipulation-
Many DOM manipulation should happen within Directives. Let’s consider that you’re implementing drag and drop functionality to components.
Definitely, you can create a component and bind events, but at such a way, you’re mixing two things:
- how the component looks
- how a certain component’s feature behaves
Directive are reusability feature in Angular and it can be used to take off lots of responsibility from components.
7. Smart/Dumb Component Architecture-
While building angular apps, you might put everything into components. But it is not a best practice. Main idea of smart/dumb components in Angular is that needs to be talked about more, particularly in beginners community. Regardless of whether a component is smart/dumb determines its role in the scheme of the application. Mostly Dumb components are stateless with behaviors that are simple to predict and understand. Ensure your component dumb whenever possible.
Smart components are difficult to grasp because inputs and outputs are included. So as to appropriately use Angular’s capabilities, look into smart/dumb component architecture. It will give you patterns and mindsets on how to work with your code and its relationships with each other.
8. Route Guards, Pre-loads, Lazy-loading-
If you’ve login of some kind, you need route guards. Concept is that, in many apps, you can protect particular views from unauthorized views is an important requirement. Route guards acts as an interface between the router and the requested route. It is the decision maker that decides whether a specific route is allowed access or not. There is lot to explore about route guards- routing decisions based on things such as token expiration, user roles authentications and route securities.
Pre-loads and lazy loading can improve your user’s experience by improving app’s load time. Also keep in mind that, pre-loads and lazy-loading are more than only deciding if you’re going to load a specific set of images or not. It improves bundled architectures and load different parts of app which may exist on different scopes and domains.
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