Skill Requirements For Senior Angular Developers
- Expert Angular knowledge and its different versions
- Component-based architecture
- Designing for specific requirements
- Maintaining and upgrading applications
- Experience in frameworks/toolkits/libraries you use
- Efficient programming and clean code
- End-to-end testing and unit testing
- Leadership skills
How Do You Create App Shell In Angular
What Are Decorators And Their Types In Angular
Types of decorators:
- Method Decorator: Method decorators, as the name implies, are used to add functionality to the methods defined within our class.
- Class Decorator: Class Decorators are the highest-level decorators that determine the purpose of the classes. They indicate to Angular that a specific class is a component or module. And the decorator enables us to declare this effect without having to write any code within the class.
- Parameter Decorator: The arguments of your class constructors are decorated using parameter decorators.
- Property Decorator: These are the second most popular types of decorators. They enable us to enhance some of the properties in our classes.
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What Is The Difference Between Observables And Promises
This is another basic question, and the developer should understand the key differences. In general, observables are lazy, cancellable, deliver errors to the subscribers, and handle multiple asynchronous events over a period of time. Promises, on the other hand, deal with a single event at a time, are not lazy, are not cancellable, and push errors to child promises.
Angular Junior Developer Interview Questions
These are some Angular basic interview questions for screening junior developers. Its important to know before hiring a Junior Angular developer that they will need guidance from more experienced developers.
Therefore, a great junior dev will be able to execute tasks given by senior developers. Skip to the Senior Developer section if you need someone who can lead your AngularJS application.
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What Exactly Is A Parameterized Pipe
To fine-tune its output, a pipe can receive any number of optional parameters. The parameterized pipe is constructed by first stating the pipe name followed by a colon and then the parameter value. If the pipe supports several arguments, use colons to separate the values.
Example: Let’s look at a birthday with a certain format :
import from '@angular/core' @Component export class ExampleComponent
What Is The Component Decorator In Angular
TypeScript classes are used to create components. This class genre is then decorated with the “@Component” decorator. The decorator’s function is to take a metadata object holding component information and decorate it.
Example: The example below shows us a Class decorated with the @Component decorator.
import from '@angular/core' @Componentexport class AppComponent
The metadata object received by the decorator has values such as templateUrl, selector, and others, with the templateUrL property pointing to an HTML file that defines what you see on the application.
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What Is Data Binding How Many Ways It Can Be Done
Ans: Data binding is a powerful and essential feature in any software development language. It allows us to demonstrate communication between view and component. The following are the different types of data binding:
- Event binding: It is defined as sending/updating the information of certain variables from view to the component.
- Property binding: It is defined as updating the information/values of a certain variable from component to view.
- Two-way binding: It is a combination of event and property binding. It defined as updating the values or information from components to view and from view to the component.
Explain Ngfor Directive With An Example
Ans: The ngFor directive instantiates a template for every element of the given iterator. The different local variables of the ngFor directive can be used in iterations. The ngFor directive can even be used with the HTML elements.
It also performs various changes in DOM. Several exported values can be aliased to local variables with the help of ngFor directive. It allows us to build data presentation lists and tables in our HTML templates. Heres an example of ngFor directive with the help of HTML:
< tr *ngFor="hero of heroes"> < td> < /td> < /tr>
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Angular 5 Interview Questions
Angular 5 was released in November 2017. Here are Angular interview questions for version 5.
What are Angular 5 Building Blocks? What are The Different Types?
Angular building blocks are simply components that are used to develop the code and application. The different types of building blocks primarily include modules, components, templates, metadata, data binding, directives, services, and dependency injection.
What is an AsyncPipe?
According to Angular, the async pipe subscribes to an Observable or Promise and return the latest value it has emitted. This helps avoid memory leaks and change detections work effectively with the AsyncPipe. Experienced and knowledgeable Angular developers typically integrate AsyncPipe promises and observations into their code.
What are Lifecycle Hooks in Angular 5? What are Their Purposes?
Lifecycle hooks in Angular allow you to run code at a specific lifecycle. Lifecycle events are a part of a component or directive. Developers should know how to make an Angular application and have the ability to integrate lifecycle hooks within it. In total, there are 8 lifecycle hooks that trigger actions at specific points in the lifecycle.
How Pure And Impure Pipe
A pure pipe is called only when Angular identifies a modification in either the value or parameter passed to a pipe. For instance, any modifications to a primitive input value or a changed object reference .
An impure pipe is invoked for each change alteration cycle irrespective of whether the parameters or value modifies. Keep in mind that an impure pipe is called frequently as frequently as each mouse-move or keystroke. Theangular js training in Hyderabad will reinforce your base for Angular.
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What Is A Singleton Pattern And Where We Can Find It In Angular
Singleton pattern in Angular is a great pattern which restricts a class from being used more than once. Singleton pattern in Angular is majorly implemented on dependency injection and in the services. Thus, if you use new Object without making it a singleton, then two different memory locations will be allocated for the same object. Whereas, if the object is declared as a singleton, in case it already exists in the memory then simply it will be reused.
How Do You Test Angular Application Using Cli
Angular CLI downloads and install everything needed with the Jasmine Test framework. You just need to run ng test to see the test results. By default this command builds the app in watch mode, and launches the Karma test runner. The output of test results would be as below,
10% building modules 1/1 modules 0 active...INFO : Karma v1.7.1 server started at http://0.0.0.0:9876/...INFO : Launching browser Chrome ......INFO : Starting browser Chrome...INFO : Connected on socket ...Chrome ...: Executed 3 of 3 SUCCESS
Note: A chrome browser also opens and displays the test output in the “Jasmine HTML Reporter”.
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What Are Template Expressions
A template expression in Angular is an expression that is represented in double curly braces } and produces a value. The template expression is executed by Angular and is assigned to a property of a binding target. Now, the binding target can be any of these- HTML element, a directive or even a component.
How Do You Update Specific Properties Of A Form Model
You can use patchValue method to update specific properties defined in the form model. For example,you can update the name and street of certain profile on click of the update button as shown below.
< button="updateProfile"> Update Profile< /button>
You can also use setValue method to update properties.
Note: Remember to update the properties against the exact model structure.
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Angularjs Developer Interview Questions
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What Is Transpiling In Angular
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How To Structure Senior Developer Interviews
Remember that this interview is designed to identify candidates who have expert knowledge of the required fields and have the required years of experience as a software developer. As a result, candidates can expect to be asked some tough questions about the technical areas which they have highlighted in their resumes, like frameworks, libraries, and past projects.
What Are The Different Angular Versions
There are different versions of Angular that the developer should be able to describe. This question establishes the basics, and you can follow up with more specific questions about each version later in the interview. Notably, the developer should have a basic understanding of Angular version 1 or AngularJS to Angular 14.
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What Do You Understand By Angular Mvvm Architecture
The MVVM architecture or Model-View-ViewModel architecture is a software architectural pattern that provides a facility to developers to separate the development of the graphical user interface from the development of the business logic or back-end logic . By using this architecture, the view is not dependent on any specific model platform.
The Angular MVVM architecture consists of the following three parts:
Model: The Model consists of the structure of an entity and specifies the approach. In simple words, we can say that the model contains data of an object.
View: The View is the visual layer of the application. It specifies the structure, layout, and appearance of what a user sees on the screen. It displays the data inside the Model, represents the model, and receives the user’s interaction with the view in the form of mouse clicks, keyboard input, screen tap gestures, etc., and forwards these to the ViewModel via the data binding properties. In Angular terms, the View contains the HTML template of a component.
ViewModel: The ViewModel is an abstract layer of the application. It is used to handle the logic of the application. It also manages the data of a model and displays it in the view. View and ViewModel are connected with two-way data-binding. If you make any changes in the view, the ViewModel takes a note and changes the appropriate data inside the model.
Explain On How To Use Httpclient With An Example
importfrom'@angular/core' importfrom'@angular/common/http' constuserProfileUrl: string='assets/data/profile.json' @InjectableexportclassUserProfileServicegetUserProfile}
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Angular Interview Questions For Freshers
Back in the day, web developers used VanillaJS and jQuery to develop dynamic websites but, as the logic of ones website grew, the code became more and more tedious to maintain. For applications that use complex logic, developers had to put in extra effort to maintain the separation of concerns for the app. Also, jQuery did not provide facilities for data handling across views.
For tackling the above problems, client-side frameworks like Angular came into the picture, which made life easier for the developers by handling the separation of concerns and dividing code into smaller bits of information .
Client-side frameworks allow one to develop advanced web applications like Single-Page-Application. Not that we cannot develop SPAs using VanillaJS, but by doing so, the development process becomes slower.
How Is Dependency Hierarchy Formed
The dependency injection system of Angular is hierarchical. It consists of a tree of injectors that stands parallel to the applications component tree. The Dependency Hierarchy is formed with the configurations. The reconfiguration of the injectors can be done at any given level of the component tree. The providers for different injectors can also be configured in the injector hierarchy.
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What Is Angular Mainly Used For
Angular is typically used for the development of SPA which stands for Single Page Applications. Angular provides a set of ready-to-use modules that simplify the development of single page applications. Not only this, with features like built-in data streaming, type safety, and a modular CLI, Angular is regarded as a full-fledged web framework.
Which Skills Are Required To Use Angular
Are they aware that TypeScript and Angular Command Line Interface knowledge is also important, and can they show that they have the required skills to become a skilled addition to your team?
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What Are String Interpolation And Property Binding In Angular
String interpolation and property binding are parts of data-binding in Angular. Data-binding is a feature of Angular, which is used to provide a way to communicate between the component and its view . There are two ways of data-binding, one-way data binding and two-way data binding. In Angular, data from the component can be inserted inside the HTML template. Any changes in the component will directly reflect inside the HTML template in one-way binding, but vice-versa is not possible. On the other hand, it is possible in two-way binding.
String interpolation and property binding both are examples of one-way data binding. They allow only one-way data binding.
String Interpolation: String interpolation uses the double curly braces } to display data from the component. Angular automatically runs the expression written inside the curly braces. For example, } will be evaluated by Angular, and the output will be 10. This output will be displayed inside the HTML template.
Property Binding: Property binding is used to bind the DOM properties of an HTML element to a component’s property. In property binding, we use the square brackets syntax.
What To Look For In Senior Software Developers
A job advert for a senior software developer is likely to expect candidates to have already developed high-quality software that was aligned with user needs and business goals.
As a result, the right senior software engineer will need to have hands-on experience in software development and Agile methodologies, as well as detailed knowledge of one or more technologies.
Additionally, a Senior software developer can be expected to:
- Work independently with little supervision
- Have excellent organizational and problem-solving skills
- Have an analytical mind with an aptitude for problem-solving
- Take the lead on operational and technical projects
- Demonstrate the ability to create and maintain relevant processes
- Be able to work with upper management to define software requirements
- Manage project timelines and priorities
- Convert business requirements into technical specifications
- Identify, prioritize and execute tasks in the software development life cycle
- Collaborate with internal teams and vendors to fix and improve products
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What Is Transition Function
The animation transition function is used to specify the changes that occur between one state and another over a period of time. It accepts two arguments: the first argument accepts an expression that defines the direction between two transition states, and the second argument accepts an animate function.
Let’s take an example state transition from open to closed with an half second transition between states.
What Do You Understand By Directives
Directives add behavior to an existing DOM element or an existing component instance. The basic difference between a component and a directive is that a component has a template, whereas an attribute or structural directive does not have a template and only one component can be instantiated per an element in a template.
We can differentiate between three types of directives:
- Components: These directives have a template.
- Structural directives: These directives change the DOM layout by adding and removing DOM elements.
- Attribute directives: These directives change the appearance or behavior of an element, component, or another directive.
How Are Angular And Angularjs Different
Its common to see Angular and AngularJS interview questions used interchangeably. However, it will be an error to assume that these are synonyms in fact, they are separate frameworks. Here are the key differences between Angular and AngularJS:
- Architecture: Service/Controller for Angular and MVC for AngularJS
- Baseline technology: TypeScript for Angular and JS for AngularJS
- Mobile-friendliness is a characteristic of Angular but not of AngularJS
- SEO application development is limited in AngularJS.
Knowing the limitations of both technologies is crucial for developers as they will be able to recommend the framework that suits the needs of the project to a higher extent.