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Newgen Software Technologies Senior Software Engineer Interview Questions and Answers

Updated 9 Oct 2024

Q1. Dofferemt ways to prevent rerendering of a child component in react?

Ans.

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

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Q2. -React lifecycle?-Fragment vs React. Fragment? -React pure component?

Ans.

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

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Q3. JavaScript hoisting?- Let, var and cont difference?

Ans.

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 recommended for variables that should not be reassigned, while let ...read more

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Q4. Stream api find the second largest salary

Ans.

Use Stream API to find the second largest salary in an array of salaries.

  • Use Stream.sorted() to sort the salaries in descending order

  • Use Stream.skip(1).findFirst() to get the second highest salary

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Discover Newgen Software Technologies interview dos and don'ts from real experiences

Q5. Insert middle in the linked list

Ans.

Insert a node in the middle of a linked list

  • Find the middle node using slow and fast pointers

  • Insert the new node after the middle node

  • Update the pointers to maintain the linked list structure

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Q6. reverse the linked list

Ans.

Reverse a linked list

  • Iterate through the linked list and change the direction of pointers

  • Use three pointers to keep track of current, previous, and next nodes

  • Update the head of the linked list to point to the last node

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Interview Process at Newgen Software Technologies Senior Software Engineer

based on 14 interviews
2 Interview rounds
Technical Round
HR Round
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