Top Angular Developer Pitfalls to Take into Account!

Surviving in this quick-moving world is not easy.  Everyone seems to be in a rush! As a result, mistakes are bound to happen! Now there is nothing wrong with making a mistake but are you ready to bear those regrettable consequences? Certainly not! The following post precisely talks about certain Angular pitfalls to avoid while working with the platform.

Since Web Development is the hottest realm across the world. Every business and developer wish to jump on the bandwagon and make the most of the lucrative field. Also, this field has a lot of exposure. You may have come across tons of digital and printed resources that provide step-by-step instructions about developing the app or best practices in Angular to consider.

Now my only concern is that all of these development patterns, practices, and platforms share common ground, and they are all prone to similar web development issues caused by the very nature of web applications.

Apart from that, all these posts/ articles you find might emphasize what needs to be done but this one is different. It says what one must avoid for better results. But before proceeding further let us understand the technology inside/out.

  1. Meet Angular – Why is it so much in Hype in the Web Development Space?
  2. Angular Developers, it’s High Time to Avoid These Common Mistakes
  3. And That’s All For Now!

1. Meet Angular – Why is it so much in Hype in the Web Development Space?

Choosing a tech stack can be quite a tedious task. Every small, medium size, large size factors such as budget, time, app size, your end-users, project objectives, resources, etc must be taken into consideration.

It doesn’t matter whether you are a beginner, an experienced Angular developer or a veteran programmer – knowing the framework inside out is always a wise decision to take.

react vs angular vs vuejs google trends
Image Source: Google Trends

Angular was developed by Google, React by Facebook and Vue is a community-driven open-source project. At present all three of them are ruling the web development space. Let us figure out each one of these in detail.

Time to know the trio!

Angular – This one is a TypeScript based JavaScript Framework successfully backed by Google. Among the front-end development space, Angular is simply ruling the hearts of both developers as well as businesses. Angular development is widely popular among developers across the globe and used by giant organizations such as Google, Forbes, WhatsApp, Instagram, healthcare.gov, and many Fortune 500 companies.

React – React is one such JavaScript library that is highly preferable for building UI components for web applications. Maintained by Facebook, several leading brands are found using React in their development environment. React is used by Facebook, Uber, Netflix, Twitter, Udemy, Paypal, Reddit, Tumblr, Walmart, and many more. React Native, another popular venture from Facebook, is used to build native mobile apps using JavaScript and React. Many well-known companies switched to React development due to its outstanding features and functions. The React vs. Vue.js topic is also buzzing around the web and gives you ample insights to select the best framework.

Vue – And Vue turns out to be the most-discussed and rapidly growing Javascript framework. Again created by a former Google employee, this one leaves no stone unturned serving big names like Alibaba, GitLab, Baidu, and appreciated by developers and designers globally.

1.1 How to Pick the Right One?

Every web development framework is of a kind so there is no first, second and third position here. All of them are popular for some good reasons featuring some strengths, weaknesses and you can generally use either of the libraries for any project. React, Vue and Angular have a bright future.

But to be clear about one thing right away: Ultimately, it’s very important if you like a framework/ library or not. If you like its syntax, it’s a way of approaching things and if you like how you write code with it. If you don’t like technology, you’ll not be able to work with it successfully! On the other hand, you’ll be able to get a lot out of each library if you simply enjoy working with it!

2. Angular Developers, it’s High Time to Avoid These Common Mistakes

As technology continues to be considered as a “win” amongst several developers across the globe, professionals are trying to improve it as much as they can. That doesn’t mean that Angular cannot create hurdles for programmers. Even to rip the full range of benefits of the framework for a leading Angular development company like eTatvaSoft, we need to get acquainted with some common mistakes and avoid making them.

So, time to explore the common Angular pitfalls which developers do while developing apps.

2.1 Unsubscribe Operation

One of the biggest Angular pitfalls, you may ever come across. Angular Developers often make this mistake of failing to unsubscribe. And there shouldn’t be any excuse for this one! It’s pretty basic yet crucial for a successful Angular development project. Now since developers are asked to work on a plethora of methods and libraries, they must unsubscribe once they have finished using such event in JavaScript.

But isn’t this a mere clumsiness? Well, not really! Because there is a fair chance of memory leaks in the system due to lingering subscriptions. Now there are two scenarios:

  1. You trigger the OnDestroy lifecycle hook if it’s in a component that you’ve subscribed in
  2. You initiate the lifecycle hook yourself if it’s a service that you’ve subscribed in (since, in this case, there’s no available hook for your to fire)

Whatever the case is you as an Angular developer must be careful regarding this generic yet vital mistake. This will save you from long-term damage.

2.2  Not Organizing Codes Appropriately

When a developer works with Angular, the most important thing is to distribute codes into smaller components to make error tracking an easy task. But not all developers can do that. And one of the reasons behind it is that AngularJs works with MVC architecture and it has the tendency to put a huge amount of coding part on the controller.

Also never go for substitute ways, Instead, create smaller organized units for the logic layer. Initially, businesses might not find this point vital but the development will surely do. Overall, things will become simpler to perform, find pitfalls, and build each and every smaller part.

A precisely compartmentalized code helps make an app flexible enough for creation that helps as your company develops gradually.

2.3 Involving jQuery

Whether you wish to build a mobile or web application, most developers use jQuery. It is a standard library that allows the development company to manipulate DOM. But when it comes to Angular applications, jQuery is not the perfect solution. And this is something that AngularJs developers forget. The reason behind jQuery is not the best thing to solve Angular applications’ issues is that Angular itself has many features that can adequately solve problems by using third-party libraries.

2.4 Making Changes to the DOM Directly

Another common angular pitfalls conducted by an Angular developer is directly manipulating the DOM or from the controller. Often abbreviated as the API for HTML and XML documents, DOM can be used to either refresh the title of the page depending on a context change or execute SVG or control after validation error. Well, this is not it, there can be a whole lot of possibilities but what you need to look for is an easy way to escape which is not altering the DOM directly. Use jQuery or ElementRef.nativeElement or the Renderer2 service.

2.5 Improper Use of Event Handlers

Now adding functionality on predicted data such as featuring a button depending on user input, Angular can be especially perfect. Nevertheless, this does not go with one of the fundamental rules of the Angular framework, which is to place all the display and logic in order.

2.6 Acknowledging the Same Component in Multiple NgModule

Declaring a component in multiple NGModule-s is one of those most common Angular pitfalls that end up throwing an error “at” you. Wondering why? After all, you need to declare each component in its own NgModule — and to list it in the @Ngmodule.declarations array — in order for it to be available for the views.

Now in case, you need to declare the very same component in multiple modules, you’ll need to consider the relationship between those modules:

Is it a parent-child one, maybe?

So what can be done is?

  • use the child’s NGModule.declaration to declare the HeroComponent in the child module
  • use the chid’s NGModule.exports array to export the HeroComponent
  • use the parent’s NGModule.imports array to import the child module

2.7 Fail to Examine

Most of the time, we often end up overlook the fact of examining an app before its launch. This is a huge blunder angular developers often make. They do not realize the matter that bugs can be launched by many environments.

You don’t have to obtain an environment with each OS; instead, you need to examine your app with the use of well-known cross-browser testing tools.

2.8 Scope Binding

The term scope in Angular means all the built-in objects containing application data. And since we know that Angular has got many interesting features and is entirely dependent on MVC structure and scope is something that binds controller and view.

The only concern here is simple utilization of information sources are frequently limited to a model that conceivably incites accidents in the coupling framework generally. To guarantee an appropriate restricting framework and smooth turn of events, it is basic that the designer needs to amass their degree of protest appropriately.

2.9 $applyAsync Use

Do you think Angular has a polling mechanism to call $digest()? Probably Not! It is only executed because we use the directives (e.g. ng-click, input), services ($timeout, $http), and methods ($watch) that evaluate our code and call a digest afterwards.

What .$applyAsync() does is it delays the resolution of expressions until the next $digest() cycle, which is triggered after a 0 timeout, which actually is ~10ms.

There are two ways to use applyAsync now. An automated way for $http requests, and a manual way for the rest.

To make all http requests that return in around the same time resolve in one digest, do:

mymodule.config(function ($httpProvider) {
	$httpProvider.useApplyAsync(true);
});

The manual way shows how it actually works. Consider some function that runs on the callback to a vanilla JS event listener or a jQuery .click(), or some other external library. After it executes and changes models, if you didn’t already wrap it in an $apply() you need to call $scope.$root.$digest() ($rootScope.$digest()), or at least $scope.$digest(). Otherwise, you will see no change.

2.10 Utilize Batarang

Those who don’t know what is Batarang. It is a Google Chrome extension. Angular developers often use it to create and debug Angular apps. Batarang is really helpful when the developers want to apply it to abstracting scopes where they find out that the arguments are restricted. But the majority of the AngularJs developers fail to use this extension tool and this can be a huge mistake.

3. And That’s All For Now!

So this is it! You see making mistakes is quite an inevitable thing to do! But if you can learn from others, you will be able to dodge them easily.  The only issue is a problem arises when the developer cannot find out their mistakes and later the end-users face problems in using the application. All the afore-mentioned Angular pitfalls can assist you to be more careful while creating and debugging an app.

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Itesh Sharma

Itesh Sharma is core member of Sales Department at TatvaSoft. He has got more than 6 years of experience in handling the task related to Customer Management and Project Management. Apart from his profession he also has keen interest in sharing the insight on different methodologies of software development.

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    1. Eulalius Cato

      I found this blog while looking for angular development mistakes to avoid. This blog has helped me to clear some doubts and also with the help of this blog I successfully cleared an interview.