NTT DATA, Inc. Technical Lead Interview Questions and Answers

Angular has several lifecycle methods that are called at different stages of a component's life.

• ngOnInit() - called after the component is initialized

• ngOnChanges() - called when the component's input properties change

• ngDoCheck() - called during every change detection cycle

• ngAfterViewInit() - called after the component's view has been initialized

• ngOnDestroy() - called just before the component is destroyed

Pipes are a feature in Angular that allow for data transformation before displaying it in the view.

• Pipes are used to format data in the view

• They can be used to filter, sort, and transform data

• Examples include the date pipe, currency pipe, and uppercase pipe

Global error handling in Angular can be done using ErrorHandler class.

• Create a class that implements the ErrorHandler interface

• Override the handleError() method to handle errors globally

• Provide the ErrorHandler class in the providers array of AppModule

• Use the error handling service to log errors or display error messages

Custom directives are a way to extend HTML with new attributes and functionality.

• Types of custom directives are attribute, element, and class directives.

• Attribute directives modify the behavior of existing HTML elements.

• Element directives create new HTML elements.

• Class directives modify the behavior of existing HTML elements based on their class.

• To create a custom directive, use the directive() method of the AngularJS ...read more

SOLID is a set of principles for object-oriented programming to make software more maintainable, scalable, and robust.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open-Closed Principle: A class should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segregation Principle: A c...read more

MVC is a software design pattern that separates an application into three interconnected components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View is responsible for rendering the user interface

• Controller handles user input and updates the model and view accordingly

• MVC promotes separation of concerns and modularity

• Examples: Ruby on Rails, ASP.NET MVC, Spring MVC