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Angular Interview Questions Angular FAQ
Hi, Welcome to Monopoly IT Solutions, our Interview Questions / FAQs can be very helpful for interview preparation in several ways:
- Understanding the way how Questions are asked by interviewer
- Practicing Answers, find our appropriate ways of answeringand excel the interview
- Gaining Insight into the industry standard
- Reducing Anxiety of Interview
- Self analysis of Key Skills
Following are the conceptual theory questions
- Angular is an open-source front-end web framework. It is one of the most popular JavaScript frameworks that is mainly maintained by Google. It provides a platform for easy development of web-based applications and empowers the front end developers in curating cross-platform applications.
- A few of the major advantages of using Angular framework are listed below:
- It supports two-way data-binding
- It follows MVC pattern architecture
- It supports static template and Angular template
- You can add a custom directive
- It also supports RESTfull services
- Validations are supported
- Client and server communication is facilitated
- Support for dependency injection
- Has strong features like Event Handlers, Animation, etc.
- TypeScript is a superset of JavaScript that offers excellent consistency. It is highly recommended, as it provides some syntactic sugar and makes the code base more comfortable to understand and maintain. Ultimately, TypeScript code compiles down to JavaScript that can run efficiently in any environment.
- Single-page applications are web applications that load once with new features just being mere additions to the user interface.
- It does not load new HTML pages to display the new page's content, instead generated dynamically.
- This is made possible through JavaScript's ability to manipulate the DOM elements on the existing page itself.
- A SPA approach is faster, thus providing a seamless user experience.
- Decorators are a design pattern or functions that define how Angular features work. They are used to make prior modifications to a class, service, or filter. Angular supports four types of decorators, they are:
- Class Decorators
- Property Decorators
- Method Decorators
- Parameter Decorators
- In Angular, every component has a lifecycle. Angular creates and renders these components and also destroys them before removing them from the DOM. This is achieved with the help of lifecycle hooks.
- ngOnChanges() - Responds when Angular sets/resets data-bound input properties.
- ngOnInit() - Initialize the directive/component after Angular first displays the data-bound properties and sets the directive/component's input properties/
- ngDoCheck() - Detect and act upon changes that Angular can't or won't detect on its own.
- ngAfterContentInit() - Responds after Angular projects external content into the component's view.
- ngAfterContentChecked() - Respond after Angular checks the content projected into the component.
- ngAfterViewInit() - Respond after Angular initializes the component's views and child views.
- ngAfterViewChecked() - Respond after Angular checks the component's views and child views.
- ngOnDestroy - Cleanup just before Angular destroys the directive/component.
- Pipes are simple functions designed to accept an input value, process, and return as an output, a transformed value in a more technical understanding. Angular supports several built-in pipes. However, you can also create custom pipes that cater to your needs.
- Pipes are defined using the pipe “|” symbol.
- Pipes can be chained with other pipes.
- Pipes can be provided with arguments by using the colon (:) sign.
- Eager Loading - Eager loading is the default module-loading strategy. Feature modules under Eager loading are loaded before the application starts. This is typically used for small size applications.
- Lazy Loading - Lazy loading dynamically loads the feature modules when there's a demand. This makes the application faster. It is used for bigger applications where all the modules are not required at the start of the application.
