Updated July 5, 2023
Introduction to Angular 4 Interview Questions and Answers
Angular JS is a JavaScript-based web application framework that is based on MVW (Model View Whatever) based design pattern. The angular JS framework was developed by Google. It was initially released in the year 2010. It was licensed under MIT License. It was completely written in JavaScript. Angular 4 version was released in the year 2017. An angular framework is mainly based on Typescript.
Angular 4 was released immediately after Angular 2 instead of Angular 3 with major features and as a breakthrough release. It supports cross-platform and can be used to develop Single Page Applications in web application development.
Now, if you are looking for a job that is related to Angular 4 then you need to prepare for the 2023 Angular 4 Interview Questions. It is true that every interview is different as per the different job profiles. Here, we have prepared the important Angular 4 Interview Questions and Answers which will help you get success in your interview.
Below are the 10 important 2023 Angular 4 Interview Questions and Answers that are frequently asked in an interview. these questions are divided into two parts are as follows:
Part 1 – Angular 4 Interview Questions (Basic)
This first part covers basic Interview Questions and Answers
1. What is Binding and different types of binding in Angular 4?
Answer:
The process of binding in Angular 4 is a process of establishing synchronization between the View and Model Components which are different layers in the application. The feature of data binding is available since Angular 2. The different kinds of binding are Two Way binding, Event binding, and Property binding. This data binding is an important and key factor in Angular components. Two-way binding is the combination of Event binding and Property binding features where Event binding is defined as the process of updating the values of a variable or attribute from View component layer to Model Component Layer and Property Binding is defined as the process of updating the of a variable or attribute in Model component and displaying the values in View component.
2. What is the difference between Components and Directives in Angular 4?
Answer:
The Components in Angular 4 are defined as the basic classes which interact with the web page components such as HTML files or UI elements. The components will be defined as Components using Decorators. Each and every component will be designated with a predefined template. A Class can be defined using an Angular Directive to make it a Directive that can be used at run time by processing and instantiating.
3. What is Typescript and how will it be useful in Angular 4?
Answer:
Typescript is a general-purpose programming language developed by Microsoft and also a superset of JavaScript programming language. Angular 4 framework is completely built on top of Typescript language. Typescript is a primary language used in Angular which is being treated as a first-class citizen. Typescript can be used to develop Angular apps and the code will be transpiled later using transpilers to support multiple or different versions of browser platforms.
4. What are Components in Angular 4?
Answer:
This is the common Angular 4 Interview Questions that are asked in an interview. The Components in Angular 4 are defined as the basic classes which interact with the web page components such as HTML file. The components will be defined as Components using Decorators. Each and every component will be designated with a predefined template. A component can be defined using @Component which is called as Decorator. The selector, style, and template can be defined inside the component to implement further functionality.
5. What are the Modules in Angular 4?
Answer:
A Module in Angular is defined as the file where all the Directives, Components, Pipes and Services are grouped and interlinked together to make it a perfect working Angular application. Every Angular app has a root module that will be defined inside app.module.ts which is the Typescript file format. To define a module in Angular 4, NgModule can be used.
Part 2 –Angular 4 Interview Questions (Advanced)
Let us now have a look at the advanced Interview Questions.
6. What is Routing in Angular 4?
Answer:
Routing in the Angular application is the process of applying routes to different components to display the content of the component defined mainly in Single Page Applications. This routing configuration can be defined in the root AppModule. The Router functionality in Angular enables the users to navigate from one task to different other tasks while performing multiple functionalities. A Route is defined as the application by mapping the URL to the different components.
7. What are the Directives in Angular 4?
Answer:
The Directives in Angular 4 can be defined as the extended HTML attributes which can be defined as custom attributes. The Directives in Angular 4 can be pre-defined or can be Custom defined to manipulate the functionality of DOM elements. There are three different kinds of Directives in Angular 4, they are Components, Structural Directives and Attribute Directives. The Components are nothing but directives with a template. The Structural Directive is defined as which changes the DOM structure by adding or removing the DOM elements. The Attribute Directives are defined as a modification in the behavior of a component, or an element or any other directive.
8. What are isolated unit tests in Angular 4?
Answer:
This is the frequently asked Angular 4 Interview Questions in an interview. The Isolated Unit Test is defined as the process of performing tests on a component or class in an isolated way rather than establishing any dependency with other components. It means that testing will be performed based on every individual component and element in isolation. Isolated Unit Tests are useful in testing the Angular Services and Pipes. The process of developing pipes in Angular which will be transformed into different kinds before being displayed needs careful testing in order to produce efficient data operations between Model and View components.
9. What are Services in Angular 4?
Answer:
The Services in Angular is defined as the process of using the core functionality of the other Components in one component. The applications such as data connections that need to be utilized across different components can be achieved by using the Services in Angular 4. The process of presenting the data from Model to View or vice versa is established by using Services. Services are the best of applying communication across different classes that do not know each other.
10. What is Dependency Injection (DI) in Angular 4?
Answer:
The Dependency Injection in Angular 4 is defined as the process of isolating the dependencies and tight coupling across different components. This will hold the dependencies of components in other components. Angular-Dependency Injection is the way of creating objects which depend on other objects. The instances of other components will be created or injected into another component using the Injection feature.
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