10+ VVDN Technologies Interview Questions and Answers

Use a routing library like React Router to manage navigation and organize components into separate pages.

• Utilize React Router to set up routes for each page and handle navigation

• Organize components into separate folders based on their functionality or page they belong to

• Consider lazy loading components to improve performance, especially with a large number of pages

Implemented a complex data migration from legacy system to new system

• Identified all data sources and mapped them to new system

• Developed custom scripts to transform and validate data

• Performed multiple test runs to ensure data integrity

• Coordinated with stakeholders to ensure smooth transition

There are three ways to communicate in LWC: event communication, public properties, and method calls.

• Event communication: Components can communicate by firing and handling events.

• Public properties: Components can communicate by passing data through public properties.

• Method calls: Components can communicate by calling methods on other components.

To swap the value of two variables without using a third variable, use arithmetic operations.

• Use addition and subtraction to swap values

• Example: a = 5, b = 10. a = a + b (a = 15), b = a - b (b = 5), a = a - b (a = 10)

Optimizing an application involves identifying and resolving performance bottlenecks to improve efficiency and user experience.

• Identify and address slow database queries or inefficient code

• Implement caching mechanisms to reduce load times

• Optimize images and assets to reduce file sizes

• Utilize asynchronous processing to improve responsiveness

• Profile and analyze code to identify areas for improvement

Inner join returns only the rows that have matching values in both tables, while left/right/full outer join returns all rows from one table and matching rows from the other table.

• Inner join: returns rows with matching values in both tables

• Left join: returns all rows from the left table and matching rows from the right table

• Right join: returns all rows from the right table and matching rows from the left table

• Full outer join: returns all rows when there is a match in either ta...read more

Context API is a feature in React that allows sharing data between components without having to pass props through every level of the component tree.

• Context API provides a way to pass data through the component tree without having to pass props down manually at every level.

• It is particularly useful for passing down global data like themes, user authentication, or language preferences.

• Context API consists of three main parts: the Provider, the Consumer, and the useContext hook...read more

In LWC, == is used for loose equality comparison while ==== is used for strict equality comparison.

• == is used for comparing values without considering data types

• === is used for comparing values while also considering data types

• Example: '1' == 1 will return true, but '1' === 1 will return false

Test suite for a login form

• Test for valid username and password

• Test for invalid username and password

• Test for empty username or password field

• Test for special characters in username or password

• Test for maximum character limit in username and password fields