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Ans is: The program will result 1 2 option 3 is correct

What is the output of following Python Code?😁 Basic one

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Reactjs interview Questions

➀➁ Difference between useState and useRef. ➀➂ What is useContext? ➀➃ Explain how to manage contexts in components and how useContext fits in there. ➀➄ What is memoization and how does React achieve it? ➀➅ Explain the useMemo hook.

➆ Compare useState with the state management in class-based components. ➇ What is useEffect? ➈ Which life cycle methods are internally handled by useEffect? ➉ What is useRef? ➀➀ Give some scenarios where useRef should be used.

➑ Introduction to Hooks ➀ What is a hook? ➁ Name the hooks which React provides out-of-the-box. ➂ What are the general conventions for naming a hook? ➃ From where can a React hook be called? ➄ Point out a few places where a hook can't be used. ➅ What is useState?

➐ Component Rendering ➀ What do you mean by rendering a component? ➁ Where to define rendering logic in a class-based component v/s function-based component? ➂ What may cause the rendering process slower? ➃ What is rerendering of a component and when does it happen?

➏ Data Binding ➀ What is data binding? ➁ What are the different types of data binding? ➂ What kind of data binding does React allow? ➃ Which data is available for binding in React?

➄ How states are set in a class-based component? ➅ How states are set in a function-based component? ➆ How to define props in a class-based component? ➇ How to define props in a function-based component? ➈ Explain the behavior when a state's value is changed.

➎ States and Props ➀ What is a state? ➁ What is a prop? ➂ Difference between a state and a prop? ➃ What is a stateful component and a stateless component?

➅ Explain the life cycle of a component. ➆ What is a life cycle method and what is its purpose? ➇ Give examples of some life cycle methods and their usage.

➍ Components ➀ What is a component? ➁ How many ways can a component be defined? ➂ How to define a class-based component? ➃ How to define a function-based component? ➄ What are the advantages and disadvantages of defining a component function-based vs. class-based?

➌ Virtual DOM ➀ What is a Virtual DOM? ➁ Why does React use a Virtual DOM? ➂ Advantages of Virtual DOM over normal DOM? ➃ Explain how the Virtual DOM works. ➄ When and how are changes propagated to the real DOM?