Basic Angular Interview Questions
Essential Angular Interview Questions
Basic Angular Interview Questions
In Angular interviews, candidates are often asked about the fundamentals of Angular such as the difference between components and directives, how data binding works, the lifecycle hooks in Angular, the differences between services and components, and how routing works in Angular applications. They may also be quizzed on how Angular handles dependency injection, the purpose of modules in Angular, and how to handle forms in Angular applications. Understanding these concepts will help candidates demonstrate their knowledge and proficiency in building web applications with Angular.
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1 - What is Angular and how does it differ from AngularJS?
Angular is a front end web framework developed by Google, commonly used for building single page applications. Angular is a complete rewrite of AngularJS, with a focus on improved performance and maintainability. Angular uses TypeScript, a superset of JavaScript, while AngularJS primarily uses JavaScript. Angular also introduces features like components, modules, and decorators which are not present in AngularJS.
2) Explain the key features of Angular.
Angular comes with a range of powerful features such as two way data binding, dependency injection, directives, templates, observables, and services. Two way data binding allows automatic synchronization of data between the model and view components. Dependency injection helps manage the components' dependencies, making them more testable and reusable. Directives are markers on DOM elements that tell Angular to attach a special behavior to them, like hiding, showing, or manipulating the DOM elements. Templates help define the UI of an application using HTML. Observables are used for handling asynchronous data and events in Angular applications.
3) What are components in Angular?
Components are the basic building blocks of an Angular application. They are used to encapsulate the data, HTML templates, and logic of a particular view or component. Each component typically consists of four parts: the component decorator, the component class containing data and logic, the HTML template for the view, and the related styles. Components can be created using the Angular CLI command `ng generate component <component name>`.
4) How does data binding work in Angular?
Data binding is a key concept in Angular that allows communication between the component and the view. There are four types of data binding in Angular: Interpolation binding ({{ }}), Property binding ([property]), Event binding ((event)), and Two way binding ([(ngModel)]). Interpolation binding is used to output data from the component to the view. Property binding is used to set the properties of an HTML element. Event binding is used to handle events raised from the DOM like click, change, keyup, etc. Two way binding is a combination of property binding and event binding, providing a seamless way to react to user input and update data between the component and the view.
5) What is dependency injection in Angular and why is it important?
Dependency Injection (DI) is a design pattern in Angular that allows components to request dependencies from an external entity, typically a service. This pattern makes components loosely coupled, reusable, and easier to test. DI helps manage the dependencies of components by providing objects that a class needs (services or other objects) instead of the class creating them itself. It encourages the separation of concerns and promotes modularity in Angular applications.
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