Category: ReactJS Interview Question
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Explain the lifecycle methods of components.
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What are the differences between class and functional components?
Class Components Functional Components State Can hold or manage state Cannot hold or manage state Simplicity Complex as compared to the stateless component Simple and easy to understand Lifecycle methods Can work with all lifecycle methods Does not work with any lifecycle method Reusability Can be reused Cannot be reused
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How can you embed two or more components into one?
We can embed two or more components into one using this method:
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What is a higher-order component in React?
A higher-order component acts as a container for other components. This helps to keep components simple and enables re-usability. They are generally used when multiple components have to use a common logic.
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What are the differences between state and props?
State Props Use Holds information about the components Allows to pass data from one component to other components as an argument Mutability Is mutable Are immutable Read-Only Can be changed Are read-only Child components Child components cannot access Child component can access Stateless components Cannot have state Can have props
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How do you pass props between components?
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How do you update the state of a component?
We can update the state of a component by using the built-in ‘setState()’ method: