Ethical Den Interview Questions and Answers

To switch between tabs in a browser using Selenium, we can use the getWindowHandles() method and switchTo() method.

• Use getWindowHandles() method to get the handles of all open tabs

• Store the handles in a Set

• Use switchTo() method to switch to a specific tab by passing the handle as an argument

Code to give rating in webtable for given applicant name and rating as input.

• Create a function that takes applicant name and rating as input.

• Search for the applicant name in the webtable.

• Update the rating for the applicant in the webtable.

• Return the updated webtable.

Count the number of repeated integers in an array

• Iterate through the array and use a hash table to keep track of the count of each number

• Return the count of numbers with a count greater than 1

Design an online automobile service center website

• Include a user-friendly interface for booking appointments and services

• Provide detailed information about the services offered and their pricing

• Incorporate a feature for customers to track the progress of their service

• Include a section for customer reviews and ratings

• Ensure the website is mobile-responsive for easy access on-the-go

Testing is the process of evaluating a system or its component(s) with the intent to find whether it satisfies the specified requirements or not.

• Testing is done to identify defects or errors in the system

• It involves executing a system or component with test cases

• The goal of testing is to ensure that the system meets the requirements and works as expected

• Types of testing include functional, performance, security, and us

Manual testing is done manually by humans while automation testing is done using tools and scripts.

• Manual testing is time-consuming and prone to human errors while automation testing is faster and more reliable.

• Manual testing is suitable for exploratory testing while automation testing is best for regression testing.

• Manual testing requires human skills and knowledge while automation testing requires programming skills.

• ...read more

React lifecycle, Fragment vs React.Fragment, React.PureComponent

• React lifecycle consists of mounting, updating, and unmounting phases

• Fragment is a shorthand for React.Fragment, used to group multiple elements

• React.PureComponent is a class component that implements shouldComponentUpdate method for performance optimization

JavaScript hoisting and differences between let, var and const.

• Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope.

• Var declarations are hoisted to the top of their scope, while let and const declarations are not.

• Var can be redeclared and reassigned, let can be reassigned but not redeclared, and const cannot be reassigned or redeclared.

• Using const is recommend...read more

Prevent rerendering of a child component in React

• Use shouldComponentUpdate() lifecycle method

• Use React.memo() to memoize functional components

• Use PureComponent instead of Component

• Pass props as a callback function to avoid unnecessary re-renders

• Use React.PureComponent for class components

• Use React.memo() for functional components