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React Context API Quiz

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Question 1/15

What are the primary pieces of the Context API?

Select your answer

Consumer, Middleware, Reducer

Hooks, Provider, Consumer

Context, Provider, Consumer

Context, Reducer, Dispatcher

Question 2/15

What is a consumer in the context of the React Context API?

Select your answer

A hook that allows components to mutate the context value.

A component that provides a context value to its descendants.

A component or hook that subscribes to context changes and receives current context value.

A function that destroys context instances.

Question 3/15

How can you access context value inside a class component?

Select your answer

By calling

this.context

directly in render.

It is not possible to access context in class components.

By using Context.Consumer, then wrap the render method.

By adding

useContext

hook at the top of the class component.

Question 4/15

Using context effectively can help in avoiding which React issue?

Select your answer

Slow rendering

Inline styles

Prop drilling

Code splitting

Question 5/15

What is the purpose of the React Context API?

Select your answer

To enhance component performance by caching props.

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

To replace all state management libraries like Redux.

To allow prop drilling for better component organization.

Question 6/15

What is the default value in a React Context and when is it used?

Select your answer

It resets the context after every re-render.

It is a fallback value used when a Context.Provider is absent.

It is a value that indicates null state.

It sets the value that all components must follow.

Question 7/15

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 8/15

Does Context only work with string data types?

Select your answer

Yes, it is optimized for strings only.

No, it works with any type of data including objects and arrays.

Context is a property of Redux for strings.

It works best with numbers only.

Question 9/15

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

Select your answer

useReducer()

useEffect()

useContext()

useState()

Question 10/15

When should you consider using the React Context API?

Select your answer

When you are passing props through multiple levels of components but not all components need it.

For small, localized state that only affects single components.

To replace useState in all functional components.

To avoid passing callbacks to modify data.

Question 11/15

What is recommended when using multiple contexts in an application?

Select your answer

Nest contexts within components intending to consume both contention values.

Use a single, large context to hold all state data.

Use context only in development mode.

Avoid using more than one context at all costs.

Question 12/15

When a context changes, which components are the most affected?

Select your answer

All components that consume that particular context.

Components that neither consume nor provide the context value.

Only components directly below the provider.

Every component in the application tree re-renders.

Question 13/15

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

DefaultName

Blank, it will throw an error

Undefined

John

Question 14/15

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.

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

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

Question 15/15

How do you create a Context in React?

Select your answer

Using

React.makeContext()

Using

React.useContext()

Using

React.createContext()

Using

React.createGlobalState()

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What are the primary pieces of the Context API?

Available answers

Consumer, Middleware, Reducer

Hooks, Provider, Consumer

Context, 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 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is a consumer in the context of the React Context API?

Available answers

A hook that allows components to mutate the context value.

A component that provides a context value to its descendants.

A component or hook that subscribes to context changes and receives current context value.

A function that destroys context instances.

A consumer is a component or a hook that subscribes to context changes and receives the current context value. Components within a Context.Consumer will re-render whenever the context value changes.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

How can you access context value inside a class component?

Available answers

By calling <pre><code>this.context</code></pre> directly in render.

It is not possible to access context in class components.

By using Context.Consumer, then wrap the render method.

By adding <pre><code>useContext</code></pre> hook at the top of the class component.

In a class component, you can access context by using

Context.Consumer

wrapped around your render method or by assigning contextType to your class and then accessing it through

this.context

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

Using context effectively can help in avoiding which React issue?

Available answers

Slow rendering

Inline styles

Prop drilling

Code splitting

Using the context API effectively helps avoid prop drilling, which is the process of passing props through several layers of components, especially when not all layers need the prop.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the React Context API?

Available answers

To enhance component performance by caching props.

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

To replace all state management libraries like Redux.

To allow prop drilling for better component organization.

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 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the default value in a React Context and when is it used?

Available answers

It resets the context after every re-render.

It is a fallback value used when a Context.Provider is absent.

It is a value that indicates null state.

It sets the value that all components must follow.

The default value in a React Context is used when a Context.Provider is absent in the component tree for the context. It acts as a fallback value.

Question 7/15

😊 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 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

Does Context only work with string data types?

Available answers

Yes, it is optimized for strings only.

No, it works with any type of data including objects and arrays.

Context is a property of Redux for strings.

It works best with numbers only.

Context can handle any type of data, including primitive data types, objects, arrays, and functions.

Question 9/15

😊 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>useReducer()</code></pre>

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

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

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

You use the

useContext()

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

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

When should you consider using the React Context API?

Available answers

When you are passing props through multiple levels of components but not all components need it.

For small, localized state that only affects single components.

To replace <code>useState</code> in all functional components.

To avoid passing callbacks to modify data.

You should consider using the React Context API when you find yourself passing props through multiple levels of components, especially when not all intermediate components need those props. This helps keep your components clean and focused on their own logic.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is recommended when using multiple contexts in an application?

Available answers

Nest contexts within components intending to consume both contention values.

Use a single, large context to hold all state data.

Use context only in development mode.

Avoid using more than one context at all costs.

When using multiple contexts, the recommended practice is to nest context providers within the component tree so that components intending to consume values from multiple contexts can access them in a straightforward manner.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

When a context changes, which components are the most affected?

Available answers

All components that consume that particular context.

Components that neither consume nor provide the context value.

Only components directly below the provider.

Every component in the application tree re-renders.

All components that consume the particular context will be affected (they will re-render) when the context changes because these components rely on the value provided by context.

Question 13/15

😊 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>

Blank, it will throw an error

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

The context value displayed will be

John

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

Question 14/15

😊 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.

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

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

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 15/15

😊 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.createContext()</code></pre>.

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

You create a Context in React by using the

React.createContext()

function, which returns a Context object.