Photon Interactive Full Stack Developer Interview Questions and Answers

Q1. What is hoist and closure
Ans. 
Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their containing scope during the compilation phase. Closures are functions that have access to variables from their outer scope even after the outer function has finished executing.
• Hoisting moves variable and function declarations to the top of their scope.

• Closures allow functions to access variables from their outer s...read more
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Q2. What is useCallback hook?
Ans. 
useCallback is a hook in React that returns a memoized callback function
• Returns a memoized callback function

• Helps in optimizing performance by preventing unnecessary re-renders

• Useful when passing callbacks to child components that rely on reference equality
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Update state from child compoenent