Deloitte Web Developer Interview Questions and Answers

Web developer and on 20 oct Hackerank.

26 Oct 2023 All topics

Q1. Merge sort time complexity less
Ans. 
Merge sort has a time complexity of O(n log n) in the worst case scenario.
• Merge sort divides the array into two halves, sorts them recursively, and then merges them back together.

• The time complexity of merge sort is O(n log n) in the worst case scenario.

• For example, sorting an array of 8 elements would take 3 recursive calls to merge sort.
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Q2. Palindrome with react js to show on UI
Ans. 
Create a palindrome checker using React JS to display on the UI
• Create a input field for user to enter a string

• Use state to store the input string

• Create a function to check if the input string is a palindrome

• Display the result on the UI
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Javascript question on promise, callbacks, hosting

Q1. Fir arrow function This keyword Promises Promise chain Generator function Rest operator Spread operator React hooks Higher order component Redux life cycle Palindrome string code Fibonacci code
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Q1. 1) what is ReactJs?
Ans. 
ReactJS is a JavaScript library for building user interfaces.
• Developed by Facebook

• Uses a virtual DOM for efficient updates

• Supports server-side rendering

• Can be used with other libraries and frameworks

• Uses JSX syntax to write HTML-like code in JavaScript

• Example: Facebook, Instagram, Airbnb, Netflix use ReactJS
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Q2. 2) What us UseState() In React
Ans. 
UseState() is a hook in React that allows functional components to have state variables.
• useState() is used to declare state variables in functional components.

• It returns an array with two elements: the current state value and a function to update it.

• The function to update the state can be called with a new value or a function that takes the previous value as an argument.

• Example: const [count, setCount] = useState(0);

• Ex
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Just asked to expand on past experiences and what technologies i had experience with.

Q1. Array linked list queue
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