Angular, the popular JavaScript framework, continues to grow in popularity as more developers choose it over other frameworks. With its implementation of the MVC pattern, dependency injection, and modularity, Angular helps you quickly build complex applications and games that are organized and maintainable. The framework offers many great features. But there are some best practices that you should keep in mind to make the most of them.
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Let’s Take a Look at the Top 10 Angular Best ractices that every developer should know about!
1. Use Angular CLI
One of the best practices is to use Angular CLI. This command line utility provides a number of benefits and streamlines the process of generating, building, testing and deploying your application. It generates an entire project for you with commands like ng new which generates an entire project with all required files.
A handles the build process for you and comes with preconfigured projects such as webpack or JSPM. It can be used to generate a quick scaffolding with Angular components, services, directives etc., by running ng generate .
2. Use Features of ES6
Start using ES6 now, and hire angular.js developers in India if you want your web app’s UI to look and feel modern. With ES6, you’ll be able to use features such as arrow functions and modules. Which will help you develop a cleaner code base that is easy for other developers to read. Here are some of the top ES6 features you should use in order to best take advantage of this exciting new technology.
- Arrow Functions – Arrow functions have fat arrows which means they have no need for the function keyword. They also don’t need parentheses or brackets. One downside to arrow functions is that they can’t be used inside regular JavaScript objects or arrays because they don’t know what this refers to when it’s not bound by an outer scope.
- Modules – Modules provide a way of organizing your code into self-contained packages.
3. Use trackBy along with ngFor
Use trackBy along with ngFor to keep the items in your data array in sync with each other. TrackBy is a special property that allows us to reference the index of an item in the array by its position in a string. For example, if we have a list of people’s names and we want to render the name for a specific person when it appears in our ngFor loop, then we can use TrackBy as follows: `ng-repeat=person in people orderby:name (person={{item.index}})` .
4. Build with Lazy Loading in Mind
Lazy Loading is a technique that allows you to load content on demand, in the background, when you scroll down the page. This means that when a user first visits your site, they will not have to wait for all of the data (images, scripts, etc) to load before they can see the content. This is an important optimization for any web app as it increases usability and provides a better experience for your visitors.
5. Use Index.ts
Use Index.ts Angular is a framework built on TypeScript, so it can be a bit tricky to figure out what’s going on when you start getting into more complex applications. One of the best tricks for navigating your way through an Angular application is using Index.ts. A common pattern in Angular is to use @Injectable() as part of the class declaration. If this pattern doesn’t match up with what you’re trying to do, then create a file called Index.ts and put all of your code inside that file.
An index file gives you the ability to break up functionality into smaller files that are easier to read and manage. You can also reference other modules within an index file by importing them in order from top-to-bottom
6. Avoid ‘any’ type
Avoid using any type of ‘any’ variable in your code. An ‘any’ variable is a generic type that can be used for any type of input, whereas a primitive variable can only be used for its specific type. This may not seem like a big deal at first glance. But it often leads to frustrating debugging sessions when you cannot figure out the problem with your code. This also becomes an issue when different libraries are used together and they have conflicting assumptions about types. Many developers recommend avoiding any type of ‘any’ variables if possible as they can lead to confusing bugs and errors.
7. Test Wisely
Testing is an essential part of the development process. While unit tests are often considered the most important type, they’re not the only ones you should write. So let’s explore the other types of testing and why it’s so important to test your code. Integration Tests- Integration tests are typically slower than unit tests but verify that different parts of a system work together as expected.
For example, if your app depends on data from an API, then you’ll want to make sure that API call works as expected in different circumstances such as when there is no internet connection or when there is a very slow connection.
8. Implementing AJAX? Use @angular/platform-browser/testing
A lot of Angular developers are implementing AJAX requests in their apps. If you’re one of these developers, please make sure that your app is fully tested with @angular/platform-browser/testing. There is a built-in test module and testing utilities that can be used for this purpose. So there’s no need to write your own tests. The documentation includes plenty of examples on how to use the platform Browser Testing module.
It’s also possible to use a third-party library like Jest or Night watch. Which have more features and plugins than the default testing suite. In order to have unit tests for individual components in isolation from other parts of the app (e2g. different view ports). It’s best practice not to inject $http service but instead use some other HTTP client implementation from angular/common package such as angular/common/http .
9. Prevent Memory Leaks in Angular Observable
Make sure that the onCompleted() callback in your Observable is wrapped with a try/catch block. This will prevent any unhandled errors from causing memory leaks in your Angular application. It’s important to remember that a callbacks passed into the observer can throw errors if they are not handled appropriately. So this can be crucial for maintaining stability and preventing issues like crashes or worse. Failing to do this may result in a memory leak as it will never get cleaned up once the operation completes, leaving you with an unusable application if left unchecked.
10. Cache API calls
Cache API calls are one of the most important Angular best practices. By caching API calls. You can avoid hitting your server every time an event happens, which will improve your site’s performance. For example, if you have a list of items that changes every five seconds and you’re showing that list to users in real-time. Then it is crucial to cache this API call so as not to unnecessarily hit the server multiple times with the same request.
Conclusion
We hope you’ve found these tips helpful. Angular can be a great tool for you and your team, but it needs to be used correctly. Keep these best practices in mind as you move forward with your project. And stay tuned for more advice on how to use Angular! The conclusion of the blog post is the continuation of the ten points presented earlier.
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