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React Context API Quiz

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Question 1/15

Which of the following is true about the `useContext` hook?

Select your answer

It cannot be used in React class components.

It requires a Consumer wrapper to be used.

It automatically provides a default context value.

It can be used in both class and functional components.

Question 2/15

Can you use multiple Context Providers in a single component?

Select your answer

Yes, you can nest multiple Context Providers within a single component.

No, React doesn’t support multiple contexts.

No, only one Context Provider can be used per component.

Yes, but only if the contexts are nested within each other.

Question 3/15

What is the purpose of the React Context API?

Select your answer

To allow prop drilling for better component organization.

To enhance component performance by caching props.

To replace all state management libraries like Redux.

To provide a way to manage global state without passing props manually through component trees.

Question 4/15

What are the primary pieces of the Context API?

Select your answer

Consumer, Middleware, Reducer

Context, Provider, Consumer

Hooks, Provider, Consumer

Context, Reducer, Dispatcher

Question 5/15

How do you create a Context in React?

Select your answer

Using

React.makeContext()

Using

React.useContext()

Using

React.createGlobalState()

Using

React.createContext()

Question 6/15

What one should keep in mind about the frequency of context value updates?

Select your answer

Update context frequently as it encourages efficient data binding.

Context updates don't affect rendering performance.

Few updates are fine, but frequent updates might cause performance concerns.

Frequent updates reduce re-rendering overhead.

Question 7/15

Consider the following code. Which context value will be displayed in the Component?

const NameContext = React.createContext('DefaultName');

function Component() {
  const name = React.useContext(NameContext);
  return <p>{name}</p>;
}

function App() {
  return (
    <NameContext.Provider value="John">
      <Component />
    </NameContext.Provider>
  );
}

Select your answer

John

DefaultName

Undefined

Blank, it will throw an error

Question 8/15

Which hook do you use to access context value in a functional component?

Select your answer

useState()

useReducer()

useEffect()

useContext()

Question 9/15

Choose the correct statement about the Context API.

Select your answer

Context values are scoped only to the immediate wrapped component.

Context values are lazily loaded.

Once a context is created, it cannot be updated.

Multiple contexts can be consumed within the same component.

Question 10/15

What does the React Context Provider do?

Select your answer

It initializes a context that can be accessed by any component that is a descendant of the provider.

It stores global event listeners for an application.

It allows components to consume context values.

It wraps components to provide them with localized CSS.

Question 11/15

Can Context API replace Redux in all use cases?

Select your answer

No, Redux is a library and Context API is a built-in React API.

Only for small to medium applications where state doesn’t need complex management or middleware.

Yes, but only for server-side rendering applications.

Yes, Context API is more powerful than Redux.

Question 12/15

What is `React.createContext()` used for?

Select your answer

Creating a reducer function.

Creating a new component.

Initializing a state variable.

Creating a new context.

Question 13/15

Explain a simple code scenario where context would be preferred over passing props.

Select your answer

Fetching data from an API and rendering in different views.

When you want to change parent component state.

Creating new components on the fly.

Passing theme data (like dark or light mode) across multiple layers of components.

Question 14/15

Is it possible to consume a context without using a context provider?

Select your answer

Only if the context uses hooks.

Yes, but only in class components.

Yes, you will always receive a default context value in such cases.

No, a provider must always be used to consume a context value.

Question 15/15

Why would you wrap components with multiple Providers?

Select your answer

It is considered a bad practice due to performance risks.

To utilize multiple Contexts without colliding state.

To add layers of security to the Context API.

To allow deeper access to private variables in React.

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is true about the `useContext` hook?

Available answers

It cannot be used in React class components.

It requires a Consumer wrapper to be used.

It automatically provides a default context value.

It can be used in both class and functional components.

The

useContext

hook is only available in functional components. Class components must use the context type or consumer pattern to access context values.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

Can you use multiple Context Providers in a single component?

Available answers

Yes, you can nest multiple Context Providers within a single component.

No, React doesn’t support multiple contexts.

No, only one Context Provider can be used per component.

Yes, but only if the contexts are nested within each other.

Yes, you can nest multiple Context Providers within a single component, and this is a common pattern to provide different slices of context data to the tree.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the React Context API?

Available answers

To allow prop drilling for better component organization.

To enhance component performance by caching props.

To replace all state management libraries like Redux.

To provide a way to manage global state without passing props manually through component trees.

The React Context API is used to create global variables that can be passed around in a React app without the need for prop drilling, which means passing props down through several levels of nested components.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

What are the primary pieces of the Context API?

Available answers

Consumer, Middleware, Reducer

Context, Provider, Consumer

Hooks, Provider, Consumer

Context, Reducer, Dispatcher

The primary pieces of the Context API are Context, Provider, and Consumer. The Context is created using React.createContext, Provider is used to pass data to its descendants, and Consumer (or useContext in functional components) is used to access the data.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

How do you create a Context in React?

Available answers

Using <pre><code>React.makeContext()</code></pre>.

Using <pre><code>React.useContext()</code></pre>.

Using <pre><code>React.createGlobalState()</code></pre>.

Using <pre><code>React.createContext()</code></pre>.

You create a Context in React by using the

React.createContext()

function, which returns a Context object.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What one should keep in mind about the frequency of context value updates?

Available answers

Update context frequently as it encourages efficient data binding.

Context updates don't affect rendering performance.

Few updates are fine, but frequent updates might cause performance concerns.

Frequent updates reduce re-rendering overhead.

Few updates are typically fine, but frequent updates might cause performance concerns due to components re-rendering with every change in context values.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Consider the following code. Which context value will be displayed in the Component?

const NameContext = React.createContext('DefaultName');

function Component() {
  const name = React.useContext(NameContext);
  return <p>{name}</p>;
}

function App() {
  return (
    <NameContext.Provider value="John">
      <Component />
    </NameContext.Provider>
  );
}

Available answers

<pre><code>DefaultName</code></pre>

<pre><code>Undefined</code></pre>

Blank, it will throw an error

The context value displayed will be

John

because the Component is wrapped with the NameContext.Provider with the value "John".

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which hook do you use to access context value in a functional component?

Available answers

<pre><code>useState()</code></pre>

<pre><code>useReducer()</code></pre>

<pre><code>useEffect()</code></pre>

<pre><code>useContext()</code></pre>

You use the

useContext()

hook in a functional component to access the current value of a context.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

Choose the correct statement about the Context API.

Available answers

Context values are scoped only to the immediate wrapped component.

Context values are lazily loaded.

Once a context is created, it cannot be updated.

Multiple contexts can be consumed within the same component.

Multiple contexts can be consumed within the same component, allowing components to access various pieces of context data as needed.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the React Context Provider do?

Available answers

It initializes a context that can be accessed by any component that is a descendant of the provider.

It stores global event listeners for an application.

It allows components to consume context values.

It wraps components to provide them with localized CSS.

The React Context Provider is used to wrap a component tree, allowing all the descendant components to access the context it provides.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

Can Context API replace Redux in all use cases?

Available answers

No, Redux is a library and Context API is a built-in React API.

Only for small to medium applications where state doesn’t need complex management or middleware.

Yes, but only for server-side rendering applications.

Yes, Context API is more powerful than Redux.

Context API can be used instead of Redux in small to medium applications where state management does not require the complex features offered by Redux, such as middleware or a global state management pattern.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is `React.createContext()` used for?

Available answers

Creating a reducer function.

Creating a new component.

Initializing a state variable.

Creating a new context.

React.createContext()

is used for creating a new context in React. This context object includes a Provider component and a Consumer component.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

Explain a simple code scenario where context would be preferred over passing props.

Available answers

Fetching data from an API and rendering in different views.

When you want to change parent component state.

Creating new components on the fly.

Passing theme data (like dark or light mode) across multiple layers of components.

Context would be preferred over passing props in a scenario like passing theme data (such as dark and light mode settings) across multiple layers of components, allowing any component within the tree to access the theme information.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

Is it possible to consume a context without using a context provider?

Available answers

Only if the context uses hooks.

Yes, but only in class components.

Yes, you will always receive a default context value in such cases.

No, a provider must always be used to consume a context value.

Yes, it is possible to consume a context without using a provider, but if you do so, you will receive the default context value that was set with React.createContext.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

Why would you wrap components with multiple Providers?

Available answers

It is considered a bad practice due to performance risks.

To utilize multiple Contexts without colliding state.

To add layers of security to the Context API.

To allow deeper access to private variables in React.

Wrapping components with multiple Providers is a common practice to utilize multiple Contexts, allowing each provider its state management without state collisions or conflicts.