IBM Reactjs Developer Interview Questions and Answers for Experienced

Q1. Basics of react, javascript, hooks
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Q1. What is Pure components/memo/useCallback/HoC
Ans. 
Pure components, memo, useCallback, and HoC are optimization techniques in React for improving performance.
• Pure components are components that only re-render when their props or state change.

• memo is a higher order component that memoizes the result of a component rendering, preventing unnecessary re-renders.

• useCallback is a hook that memoizes functions, preventing unnecessary re-creations on re-renders.

• HoC (Higher Orde...read more
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Q1. CSS specificity questions
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Q2. CSS selectors related questions
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Q3. Javascript basic questions
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Q4. React basic questions
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Q5. Javascript eventloop related guess the output.
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Q6. Write code in react of React.memo
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Q1. Scenario based and General ReactJS and javascript Questions.
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Q1. Splice & slice difference
Ans. 
Splice is used to add/remove elements from an array, while slice is used to extract a portion of an array without modifying the original array.
• Splice modifies the original array, while slice does not.

• Splice can add elements, remove elements, or replace elements in an array.

• Slice returns a new array with the selected elements from the original array.

• Example: const arr = [1, 2, 3, 4, 5]; arr.splice(2, 1); // removes elem...read more
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Q2. Coding question | How to reverse string
Ans. 
To reverse a string, iterate through the characters and swap them from start to end.
• Create an empty string to store the reversed result.

• Iterate through the characters of the input string from end to start.

• Append each character to the empty string to reverse the order.

• Return the reversed string.
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Q1. Basics of javascript and react concept.
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Asked about vanilla.js in react interview.