BT Business Operations Associate Interview Questions and Answers

State management in React involves managing the state and props of components.

• State is used to manage data that changes within a component

• Props are used to pass data from a parent component to a child component

• State can be updated using setState() method

• Props are read-only and cannot be modified within a component

• State and props are used together to create dynamic and interactive UIs

The American List of Holidays includes national, religious, and cultural celebrations observed throughout the year.

• There are federal holidays like Independence Day and Thanksgiving

• There are religious holidays like Christmas and Easter

• There are cultural holidays like Halloween and St. Patrick's Day

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