Articles

15 Tips For Frontend Developers to Optimize Angular Applications

by Gary Ferguson Technical Writer | Blogger

Optimizing an app helps achieve better performance and code maintenance. The process of optimization should begin at the same time as development as it becomes difficult to optimize a developed application. Angularjs development services also take optimizing of the app as a process at the development level for better output. The developers of an angularjs web development company also seek better ways to do better optimization at earlier stages

So, how can frontend developers do so; there are 15 tips that can help in making Angular applications faster.

1. Code Minification : Each part of the application should be minified before deploying it to the production stage. Developers who work with Webpack probably use plugins such as UglifyJS, MinifyCSS, etc. to remove the whitespace and other unexecuted functions. These plugins also change functions' and variables' names to fit the compiled bundle. But with Angular, developers don't need to add Webpack scripts to minify the code. They can make a bundle using ng build --prod command.

2. OnPush Change Detection : Every Angular component has its own Change Detector. They detect any changes made to component data and automatically re-render the view to reflect the changes. Change Detector used when DOM emits an event like form submits, button click, mouse over, etc,. And even when asynchronous interaction like setInterval or setTimeout or an HTTP request is made. On every single event, the Change Detector is triggered in the entire application tree (from the top to the bottom, starting with the root component).

3. Using Pure pipes : get used in the view is actually a function call. Using pure pipes is a better option that returns the same output, even after receiving the same input multiple times. In case the pure in the pipe is set to true (default) and the Change Detector reaches this view, it will not check whether the value has been changed.

4. Async pipe : Time: {{ time | async }}

The async pipe directly from the template allows subscribing to observable. Developers don't have to worry about unsubscribing with the async pipe. Change Detector will also check whether or not the value was changed when Observable had changed itself.

5. Unsubscribing : it's crucial not to forget about unsubscribing while using RxJS, or else, there's a risk to get memory leaks in the application.

6. Track by function :

*ngFor="let item of items; trackBy: trackByFn"

trackBy is a parameter that acknowledges a function that should return a unique value of each item of the list. Without using trackBy function, *ngFor will re-render every single component of the list every time that list changes. Only the values that have been changed will be re-rendered or deleted with trackBy function.

7. Webpack Bundle Analyzer : In the event that you discover that your pack's size is too enormous, you can check what precisely is in the package and choose whether you need all the external libraries. You can also utilize the Webpack Bundle Analyzer. All that is needed is a simple configuration based on the application needs and also analyze the output graph.

8. No need for external libraries : Once a graph has been generated with Webpack Bundle Analyzer, there is no need to add the entire library to the project. Developers should only code the same function that was imported from the library. The more the code is written by developers themselves, they will have control & understanding of the way it works and it also becomes easier to debug & maintain the code.

9. Styles per component : Developers instead of global codes should be able to write as many styles per component as possible. The global styles declare variables with form inputs, fonts, colors, like buttons, reusable components, dropdowns, keeping everything else divided into components. If the components are used in a rendered page, properties will be loaded for the better performance of the application.

10. Tree shaking : The term in a simpler manner can be understood by imagining a tree with dead leaves and it needs to be shaken so that all the dead leaves fall. So, it's like eliminating codes that are not needed.

If the code ng build --prod is used to build, the Angular CLI will compile and bundle all components into the application. The ng build --prod --build-optimizer code will omit all of the unused components. Code --build-optimizer will eliminate any dead code in JavaScript on Webpack.

11. One-time string initialization :

Developers should keep a track on binding properties between components. They need to check whether the target property accepts any string value or if the string is a fixed value that can be used directly into the template, and importantly the initial value of the same never changes.

12. Dependencies between components :

A frontend developer should know the importance of dependencies between components in the application, whether or not are they required, etc. They can check this by generating and analyzing the dependencies graph.

13. CSS vs JS animations

In the case of CSS animation, use them for self-contained states for UI elements, like a tooltip showing on hover. JS animation can be used to control the animations like slowing down, stopping, or pausing the animation, etc.

14. Lazy loading

It loads only the required modules and components. There is no need to load the entire AdminModule if the user is not the admin or if the user isn't signed into the application.

15. Throw it away to the backend : Let the backend handle as much application logic as possible. When it depends on the choice of the user, the front-end doesn't have to perform huge calculations at their end.

These tips can really help with angularjs web development services, the frontend developers can try these out to offer the best custom web application development services.

The author of this bio holds 10+ years of developing and implementing web development solutions across varied domains and technology stack. And is currently offering custom web application development services.


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About Gary Ferguson Advanced   Technical Writer | Blogger

109 connections, 0 recommendations, 263 honor points.
Joined APSense since, February 6th, 2019, From New York, USA, United States.

Created on Jun 7th 2020 23:58. Viewed 170 times.

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