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React useContext() Hook Quiz

What is the purpose of the useContext hook in React.js?

To create a new context
To consume a context value
The useContext hook in React.js is used to consume a context value.
To update the state of a component
To handle component lifecycle events

When using the useContext hook in React.js, what is the primary purpose of the context provider?

To consume the context value
To create a new context
To define the structure of the context object
To provide the context value to its descendants
The context provider in React.js is primarily responsible for providing the context value to its descendants in the component tree, allowing them to consume the context using the useContext hook.

How do you create a context in React.js?

Using the createContext function
Context is created using the createContext function.
By defining a variable with the name of the context
Automatically created by React.js
Using the context keyword

In a functional component, how do you consume a context using the useContext hook?

const context = useContext(ContextName);
The correct syntax to consume context in a functional component is const context = useContext(ContextName);
const context = this.context(ContextName);
const context = use(ContextName);
const context = this.useContext(ContextName);

How can you provide a default value to a context using the createContext function in React.js?

By using the defaultValue prop in the Context.Provider
By passing the default value directly to the useContext hook
By setting a default value using the useContextDefault method
By passing a default value to the createContext function
To provide a default value to a context when using useContext, you can pass a default value to the createContext function.

Can you use the useContext hook inside a class component?

Yes
No
The useContext hook is designed for functional components and cannot be used directly in class components.
Only in certain situations
It depends on the React version

What happens if the context provider is not present in the component tree when using useContext?

The application throws an error
The component renders without any issues
The useContext hook returns the default value
If the context provider is not present, the useContext hook returns the default value provided to createContext.
The component is automatically wrapped with a default context provider

How do you provide a context value using the Context.Provider component?

<Context.Provider value={contextValue}>...</Context.Provider>
The correct syntax to provide a context value is <Context.Provider value={contextValue}>...</Context.Provider>.
<Context.Provider data={contextValue}>...</Context.Provider>
<Context.Provider contextValue={contextValue}>...</Context.Provider>
<Context.Provider setContext={contextValue}>...</Context.Provider>

What is the purpose of the defaultValue parameter in the createContext function?

To set a default value for the context
The defaultValue parameter is used to set a default value for the context when no provider is found in the component tree.
To create a context without a default value
It is not a valid parameter for createContext
To specify the default context provider component

How can you access the context value outside of the render function in a functional component?

Using the this.context syntax
Storing the context value in a global variable
Creating a separate custom hook
To access the context value outside of the render function, you can create a separate custom hook.
Context values can only be accessed within the render function

In the useContext hook, what should be passed as an argument to identify the context to be consumed?

Context value
Context type
Context name
Context object
The argument passed to useContext is the context object, which is created using createContext.

What is the purpose of the displayName property when defining a context with createContext?

It sets the name of the context provider component
It provides a custom name for the context
It is used for debugging purposes
The displayName property provides a custom name for the context, mainly used for debugging purposes.
It has no impact on the context

How can you update the context value dynamically using the useContext hook?

Use the updateContext method
Context values are immutable and cannot be updated
Use the setContext method
By updating the value provided by the context provider
Context values can be updated dynamically by changing the value provided by the context provider component.

When using multiple contexts in a component, how do you consume them using useContext?

Call useContext for each context separately
To consume multiple contexts, you should call useContext for each context separately.
Pass an array of contexts to useContext
Use the combineContexts hook
Create a wrapper component that consumes all the contexts

What is the purpose of the Provider component in the context API?

To create a new context
To consume a context value
To provide the context value to its descendants
The Provider component is used to provide the context value to its descendants in the component tree.
To define the structure of the context object

How can you use the useContext hook in a class component?

It is not possible to use useContext in a class component
Wrap the class component with a functional component that uses useContext
To use the useContext hook in a class component, you can wrap the class component with a functional component that uses useContext.
Use the this.context syntax
Extend the class from React.ContextComponent class

What is the purpose of the useContext hook in the component lifecycle?

It is called during the component creation phase
It is called during the component update phase
It is not related to the component lifecycle
The useContext hook is not directly related to the component lifecycle; it is used to consume a context value.
It is called during the component unmounting phase

How can you share state logic between components using useContext?

Use a global variable
Pass the state as a prop
Wrap the components with a higher-order component
Define a context that holds the shared state
To share state logic between components, you can define a context that holds the shared state.

In a context provider, how can you provide multiple values to different parts of the component tree?

Create separate context providers for each value
Use the value prop with an object containing multiple values
You can provide multiple values to different parts of the component tree using the value prop with an object containing those values.
Combine values into a single string and use it as the context value
Use the values prop with an array containing multiple values

What happens if you nest multiple context providers in the component tree?

The innermost provider overrides the values of the outer providers
When nesting context providers, the innermost provider overrides the values of the outer providers.
The outermost provider overrides the values of the inner providers
Context providers cannot be nested
All context providers contribute their values to the context

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