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REACT JS TUTORIAL #4 - State vs Props & Application Data Video Lecture | Learn React JS: Fundamentals for Front-End Developers - Front-End Programming

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FAQs on REACT JS TUTORIAL #4 - State vs Props & Application Data Video Lecture - Learn React JS: Fundamentals for Front-End Developers - Front-End Programming

1. What is the difference between state and props in React JS?
Ans. In React JS, state and props are both used to manage data in a component, but they have some key differences. State is used to manage internal component data that can be changed, while props are used to pass data from a parent component to a child component. State is mutable and can be changed using the setState() method, while props are read-only and cannot be changed by the child component.
2. How can we update the state in React JS?
Ans. In React JS, the state can be updated using the setState() method. This method is provided by the React library and is used to modify the state object. When setState() is called, React will re-render the component with the updated state, causing any affected UI elements to be updated as well. It is important to note that setState() is asynchronous, so if you need to access the updated state immediately after calling setState(), you should use the second argument of setState(), which is a callback function that will be executed after the state has been updated.
3. Can we pass props from a child component to a parent component in React JS?
Ans. No, in React JS, props can only be passed from a parent component to a child component. This is because the parent component is responsible for creating and managing the child component, and it can pass any necessary data or functionality to the child component through props. If a child component needs to communicate with its parent component, it can do so by invoking a callback function passed as a prop.
4. How can we pass data between sibling components in React JS?
Ans. In React JS, if two sibling components need to share data, the common parent component can act as a mediator by passing the data as props to both sibling components. The parent component can manage the data in its state and pass it down to the child components through props. If the sibling components need to communicate with each other directly, they can do so by lifting the state up to their nearest common ancestor component and sharing the data through props.
5. Can we directly modify the props in a child component in React JS?
Ans. No, in React JS, props are read-only and cannot be directly modified in a child component. Props are meant to be passed from a parent component and provide data or functionality to the child component. If the child component needs to modify the data, it should request the parent component to update the props by invoking a callback function passed as a prop. The parent component can then update its state and pass the updated data as props to the child component.
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