5 Easy Ways to Enhance Your AngularJS Code for Improved Results | Written by Ardy Gallego Dedase | October 2023

Introduction:

When reviewing and improving your Angular codebase, it’s important to address recurring themes. In this article, we will explore five common issues and provide solutions. One such problem is memory leaks caused by incomplete observables or unsubscribed subscriptions. Instead of manually calling unsubscribe(), we can automate this process. There are also other techniques such as using first() or take(1) to retrieve values once or using the takeUntilDestroyed() operator in Angular 16. For older versions, you can complete subscriptions in ngOnDestroy(). To learn more about automatically unsubscribing multiple observables in Angular, check out our detailed blog post.

Full Article: 5 Easy Ways to Enhance Your AngularJS Code for Improved Results | Written by Ardy Gallego Dedase | October 2023

Improving Code Quality in Angular: 5 Tips for Efficient Development

Having built and maintained several Angular apps, there are a few recurring themes I encounter when I rewrite code or review a pull request. In this article, I will address five common issues and provide tips on how to improve your Angular codebase.

Issue #1: Unsubscribing from Observables

It’s important to remember to unsubscribe from the observables we subscribe to. Failing to do so can lead to memory leaks and slow down your Angular app.

To handle this automatically and prevent missing unsubscribe() calls, consider the following:

  1. If you only need to retrieve the value once, use the first() or take(1) operators.
const countries$ = ['Canada', 'United States', 'Vietnam', 'Philippines'];
countries$.pipe(take(1)).subscribe(countries => console.log(countries));

2. If you are already using Angular 16, take advantage of the takeUntilDestroyed() operator. It automatically completes your observable and unsubscribes any subscriptions.

3. If you are using older versions before Angular 16, manually complete or “destroy” your subscription in the ngOnDestroy() lifecycle hook. This is equivalent to using takeUntilDestroyed() but requires extra code.

private destroyed$: ReplaySubject = new ReplaySubject(1);

ngOnInit() {
  this.searchReposFormControl.valueChanges
    .pipe(takeUntil(this.destroyed$))
    .subscribe((searchString) => {
      if (searchString) {
        this.searchType = SearchType.REPOS;
        this.searchSubject$.next(searchString);
      }
    });
}

ngOnDestroy() {
  this.destroyed$.next(true);
  this.destroyed$.unsubscribe();
}

To learn more about automatically unsubscribing from multiple observables in Angular, check out my blog post: How to Automatically Unsubscribe Multiple Observables in Angular.

Summary: 5 Easy Ways to Enhance Your AngularJS Code for Improved Results | Written by Ardy Gallego Dedase | October 2023

Reviewing and refactoring Angular codebases can be a daunting task, but by following a few key practices, you can improve the quality and performance of your code. One important consideration is to always unsubscribe from subscriptions to prevent memory leaks. Additionally, using functions like first() or take(1) can help retrieve values efficiently. For newer versions of Angular, the takeUntilDestroyed() operator can automatically complete observables and unsubscribe subscriptions. If you’re using an older version, you can manually complete subscriptions in the ngOnDestroy() method. To learn more about these techniques, check out the blog post on how to automatically unsubscribe multiple observables in Angular.





Frequently Asked Questions – 5 Simple Improvements You Can Make To Your AngularJS Code


5 Simple Improvements You Can Make To Your AngularJS Code – FAQs

Frequently Asked Questions


Question 1: How do I improve the performance of my AngularJS code?

Answer: To improve performance, you can consider optimizing your code by reducing the number of watchers, using one-time binding when appropriate, and implementing pagination or lazy loading for large datasets.

Question 2: What are some best practices for organizing AngularJS code?

Answer: It is recommended to follow a modular structure, separate concerns using components and services, use reusable directives, and adopt a consistent naming convention for files and functions.

Question 3: How can I enhance the readability of my AngularJS code?

Answer: To improve readability, you should focus on writing clear and concise code, use meaningful variable and function names, comment your code where necessary, and properly indent your code for better visual structure.

Question 4: What are some common mistakes to avoid in AngularJS development?

Answer: Some common mistakes to avoid include creating too many $watch expressions, not using dependency injection correctly, not handling errors and exceptions, and neglecting to optimize code for performance.

Question 5: How can I ensure code reusability in AngularJS?

Answer: To promote code reusability, you should strive to create modular components, use services for shared functionality, leverage directives to encapsulate reusable behaviors, and separate business logic from the presentation layer.


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