Apponix Technologies React Js Frontend Developer Interview Questions, Process, and Tips

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Q1. Asked some question about react
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Q2. What is virtual dom
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Virtual DOM is a lightweight copy of the actual DOM that helps in efficient rendering of web pages.
• Virtual DOM is a concept used in ReactJS to improve performance.

• It is a lightweight copy of the actual DOM.

• Any changes made to the virtual DOM are first reflected in the virtual DOM and then in the actual DOM.

• This helps in reducing the number of updates required to the actual DOM, thus improving performance.

• ReactJS uses a...read more
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Q3. Whats is props ?
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Props is a shorthand for properties in React that allows passing data from parent to child components.
• Props are read-only and cannot be modified by the child component.

• Props can be any data type, including functions and objects.

• Props can be passed down multiple levels of components.

• Props can have default values set using defaultProps.

• Props can be validated using propTypes to ensure correct data types are passed.

• Example
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Q4. What is states ?
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States are objects in React that hold component data and can be updated using setState() method.
• States are used to manage component data that can change over time.

• They are defined in the constructor of a component.

• They can only be updated using the setState() method.

• Updating a state triggers a re-render of the component.

• States should not be modified directly, use setState() instead.
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Q5. Whats is propdrilling
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Prop drilling is the process of passing props through multiple levels of components to reach a deeply nested component.
• It can lead to code redundancy and make it difficult to maintain.

• Context API and Redux can be used to avoid prop drilling.

• Example: Passing props from a parent component to a child component, then to another child component, and so on.

• Example: Passing a prop from App.js to a deeply nested component like...read more
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Q6. What is state management
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State management is the process of managing and updating the data that determines a component's behavior and rendering.
• State is an object that holds data that can change over time

• State management involves updating state based on user interactions or other events

• State can be passed down to child components as props

• Popular state management libraries for React include Redux and MobX
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