Techouts Reactjs Developer Interview Questions and Answers

Q1. Asked json web tokean authentication, authorisation. architecture of your project.
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Q2. Coding question- create crud app. Given array of objects. Render list in table. Do edit, delete, sort list on object property.
Ans. 
Create a CRUD app to render, edit, delete, and sort a list of objects in a table.
• Create a React component to render a table with data from the array of objects.

• Implement functions for editing and deleting objects from the list.

• Add functionality to sort the list based on object properties.

• Use state and props to manage data and re-render the table when changes occur.
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Q3. Difference bw rem, em, px. React hooks- useEffect, life cycle methods. use cases of hooks.
Ans. 
rem, em, px are units of measurement in CSS. useEffect is a React hook for side effects. Hooks are used for stateful logic in functional components.
• rem: relative to the font-size of the root element (html). Example: 1rem = 16px

• em: relative to the font-size of the element. Example: 2em = 32px if the font-size of the element is 16px

• px: fixed-size units. Example: font-size: 14px

• useEffect: React hook used for side effects ...read more
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2 DSA question was asked

40 questions in 20 minutes

Q1. Stones games 2 leetcode
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Q2. Permutations of array
Ans. 
Generate all possible permutations of an array of strings
• Use recursion to generate permutations

• Swap elements to create different permutations

• Base case: when array size is 1, return array as permutation
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Q1. Project discussion
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Q1. How make a queue using a stack
Ans. 
To implement a queue using a stack, use two stacks and simulate the queue operations.
• Use two stacks, one for enqueue operation and one for dequeue operation.

• For enqueue operation, simply push elements onto the stack used for enqueueing.

• For dequeue operation, if the dequeue stack is empty, pop all elements from enqueue stack and push onto dequeue stack.

• Then pop from the dequeue stack to simulate dequeue operation.
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Q2. Create a linked list
Ans. 
A linked list is a data structure consisting of nodes where each node points to the next node in the sequence.
• Create a Node class with data and next pointer

• Initialize a head pointer to null

• Add nodes by updating next pointers

• Traverse the list by following next pointers
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Q1. How can you handle the task?
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It is MCQ based test which contain both aptitude and technical question

Q1. Technical question was asked
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Q1. HR question was asked
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Q1. Java Script coding question
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