Q: List the advantages of Angular

✦ TypeScript’s special optional static typing feature helps Angular to detect coding errors in compile time that saves the developer’s time and effort. ✦ As Angular is maintained by Google, it can be used till the extent of its potential to create scalable single-page applications. ✦ Multi-functional utility and robust ecosystem helps developers to experiment and add new projects that co-exist with previous ones. This helps Angular to maintain its code consistency. ✦ Adding on the previous point, two-way data binding is another advantage of Angular when you consider updating values and bind the parent and child components at the same time.

Q: List the features of Angular.

Angular is known for its following features: ✦ Cross Platform: It is not limited to frontend web browsers and can work on mobile and desktop as well. This proves its flexibility ✦ Two Way Data Binding: This feature enables flow of data between the model and the view. This means any change in either of them is automatically updated. ✦ MVC Architecture: This focuses on creating and forming User Interfaced based application and using data into your user interface ✦ Dependency Injection: This is the mechanism that helps forming and connecting different parts of an application as per their requirements. ✦ Custom Components: These components replicate a minified version of the whole framework and are used in simple web projects as well as creating custom elements.

Question 1

What is Angular Framework

Accepted Answer

Written in typescript and maintained by Google, Angular is a JavaScript software engineering framework for creating single-page client application with the use of HTML and TypeScript. It is an open-source framework and provides a standard design for developers. As a development platform, Angular involves a component-based body and a well-blended collection of libraries that enable functions like client-server communication, forms management, etc.

Question 2

Difference between Angular JS and Angular

Accepted Answer

As the name suggests, the primary difference between Angular JS and Angular is that the former is written in Java Script while the latter is written in Type Script. Although, they serve a similar purpose, being an open-source front end framework designed by Google, Angular is based on the component-based standard whereas Angular JS is based on a pure MVC (Model View Controller). This further clarifies that Angular JS separates different functions like helper methods, routing, etc. into varying levels whereas Angular contains all that in a single class.

Another difference between them is that Angular supports both Type Script and Java Script languages but Angular JavaScript supports only Java Script.

Question 3

What is Type Script

Accepted Answer

Type Script is the primary language on which Angular is built on. It is an open-source programming language, developed and maintained by Microsoft.   
TypeScript helps Angular for building scalable web applications. It is mostly used with TypeScript Compiler that helps in translating TypeScript into JavaScript. It is flexible in the way that it can run on any browser, device, or operating system. TypeScript’s optional static typing is indeed advantageous to developers when it comes to saving time and efforts in debugging.

Question 4

What is metadata?

Accepted Answer

Metadata is an integral part of Angular’s processing. Its job is to associate a class to a component, directly or indirectly. It works alongside TypeScript as a decorator to store information about a class, method or property and direct Angular about a specific configuration of specific component.

Question 5

What are templates and directives in Angular?

Accepted Answer

Templates are forms of HTML that associate components to specific attributes and directs Angular to render those components.   
Directives are classes that provide additional behavior or modify existing behavior to the elements in the template.  There are three parts of Angular Directives: Component, Structural and Attribute.

Question 6

List the advantages of Angular

Accepted Answer

&#10022; TypeScript’s special optional static typing feature helps Angular to detect coding errors in compile time that saves the developer’s time and effort.

&#10022; As Angular is maintained by Google, it can be used till the extent of its potential to create scalable single-page applications.

&#10022; Multi-functional utility and robust ecosystem helps developers to experiment and add new projects that co-exist with previous ones. This helps Angular to maintain its code consistency.

&#10022; Adding on the previous point, two-way data binding is another advantage of Angular when you consider updating values and bind the parent and child components at the same time.

Question 7

What makes Angular different from other frameworks?

Accepted Answer

Angular’s unique features make it stand out among other frameworks. These features are:

&#10022; It allows effortless multipurpose functions to be executed by offering a developer-friendly ecosystem.

&#10022; It doesn’t require additional separate libraries for specific functions like data binding, dependency injection, etc.

&#10022; Angular allows users to build custom components thus providing them a flexible work environment.

Question 8

How does Angular work?

Accepted Answer

Angular has a component-based framework and an intensive collection of libraries that cover features like routing, forms management, etc. It follows a semantic versioning based on MAJOR and focuses on single page application. Special characteristics like two-way data binding, dependency injection, and directives allow creation of reusable User Interface components.

Question 9

Where is Angular mostly used?

Accepted Answer

Angular is mostly used to create dynamic content like designing web applications of all kinds and cross-platform applications that run on web, mobile and desktop. Angular’s potential to add dynamism to the content must be utilized to its fullest or it might end up increasing the load time and the overall size of the project. For the same reason, Angular is not used for landing pages.

Question 10

List the features of Angular.

Accepted Answer

Angular is known for its following features:

&#10022; Cross Platform: It is not limited to frontend web browsers and can work on mobile and desktop as well. This proves its flexibility   
&#10022; Two Way Data Binding: This feature enables flow of data between the model and the view. This means any change in either of them is automatically updated.   
&#10022; MVC Architecture: This focuses on creating and forming User Interfaced based application and using data into your user interface   
&#10022; Dependency Injection: This is the mechanism that helps forming and connecting different parts of an application as per their requirements.   
&#10022; Custom Components: These components replicate a minified version of the whole framework and are used in simple web projects as well as creating custom elements.

Question 11

What pre-requisite skills help you use Angular efficiently?

Accepted Answer

The basic and sound knowledge of html and JavaScript are crucial when it comes to Angular. A developer must be aware of different technicalities like MVC(Model View Controller) architecture, node package manager, and an exposure to TypeScript.

Question 12

State the advantages of Angular over React.

Accepted Answer

There are several ways in which Angular surpasses React:   
&#10022; It is easier to handle large scale applications with Angular because it provides a structured approach compared to React   
&#10022; Angular supports both one-way and two-way data binding whereas React only supports one-way data binding.   
&#10022; React acts only as a User Interface library whereas Angular exists as a full-fledged front-end framework.   
&#10022; React may be a flexible library however Angular is more versatile and offers efficient tools for complex structures.

Question 13

How are Angular JS expressions different from Java Script expressions?

Accepted Answer

There are two main differences between Angular JS expressions and Java Script expressions:   
&#10022; Angular JS expressions can be written inside HTML whereas JavaScript expressions cannot be written inside HTML.   
&#10022; Unlike JavaScript expressions, Angular JS expressions do not support conditionals, loops and exceptions.   
&#10022; Angular expressions do not allow function declaration whereas JavaScript expressions allow them.

Question 14

Explain the different types of directives in Angular.

Accepted Answer

In Angular, directives are used to add behavior to elements that in turn help in managing form and what users see.   
There are three different types of directives in Angular:   
&#10022; Components: This is the most common type of directive and is used with a template.   
&#10022; Attribute directives: This is used to attribute or change appearance or behavior of an element, component, or another directive.   
&#10022; Structural directives: This is used to change the structural DOM layout by editing DOM elements.

Question 15

Explain components, modules and servers in angular.

Accepted Answer

Components are basic UI blocks of an Angular app that has metadata properties based on your different needs. They provide a particular function or a group of related functions.   
Modules contain different parts of an application and application controllers that belong to the module. They are a way of organizing an app and external libraries. There are two types of modules, root and feature modules.   
Servers in Angular are used to render an application

Question 16

What is Data Binding? Explain its types.

Accepted Answer

Data binding is an automatic synchronization of data between the model component and the view component. This process creates a connection between the app UI and the data it displays. Angular uses two-way data binding. This way, the values of an Angular component is connected with the values of an HTML template.   
&#10022; There are four types of data binding that come under Angular:   
&#10022; String Interpolation: It is a one-way databinding technique used to output data from typescript to html.   
&#10022; Property Binding: It moves a value from a component’s property into a target element property.   
&#10022; Event Binding: It enables you to catch and respond to user actions like clicks, touches, etc.   
&#10022; Two-way binding: It enables easy sharing and interchange of data between different components.

Question 17

What is two-way binding? Why is it important in angular?

Accepted Answer

Two-way binding indicates the bi-directional flow of data. It enables easy sharing and interchange of data between different components. Two-way binding helps in updating values simultaneously between parent and child component.    
This is quite advantageous for developers in the way that it reduces boilerplate code and allows developers to build UIs quickly.

Question 18

What are annotations?

Accepted Answer

Annotations, in Angular, are a type of metadata that provide additional information about a class or its members. They help in configuring various parts of components, services and modules. Annotation is a block of text that can be displayed over a node or connector.

Question 19

What are pure and impure pipes?

Accepted Answer

In Angular, pipes are simple functions used in template expressions that take an input value and return a transformed value.    
Pure pipes are executed when a pure change to the input value is detected. This implies that changes within objects are ignored by pure pipes.    
Impure pipes are executed every time there is a change within the objects, like change in array entries or object properties, etc.

Question 20

How is dependency hierarchy formed?

Accepted Answer

Dependency hierarchy is formed when the tree of injectors run parallel to an app’s component tree such that the injectors can be reconfigured at any level. Providers for different injectors can be configured for different injectors in the injector hierarchy.    
An Angular application is a tree of components where every component has its own injector.

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