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React and GraphQL Quiz

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Question 1/15

What is the purpose of the Apollo Link in the context of Apollo Client?

Select your answer

To execute REST API calls outside GraphQL.

To create a request pipeline for outgoing operations.

To manage CSS within GraphQL queries.

To handle cookies across different domains.

Question 2/15

In GraphQL, what is the purpose of fragments?

Select your answer

To enable reusable units of query logic across operations.

To handle queries that exceed the character limit.

To perform authentication of query operations.

To split queries across multiple HTTP requests.

Question 3/15

What does the term 'optimistic UI update' refer to in the context of Apollo Client?

Select your answer

It refers to updating UI only after receiving a successful query response.

It refers to waiting for error handling before updating the UI.

It refers to performing no change until server-side processing is complete.

It refers to updating the user interface immediately, anticipating a successful mutation response.

Question 4/15

Which HTTP method corresponds to the GraphQL query operation?

Select your answer

DELETE

PUT

GET

POST

Question 5/15

How does the useQuery hook in Apollo Client manage data fetching in a React application?

Select your answer

It automatically fetches and updates data and provides loading and error states.

It only fetches data once and never updates.

It requires manual fetching of data when the component is mounted.

It handles only mutation operations, not queries.

Question 6/15

What is the purpose of the component in Apollo Client?

Select your answer

To execute a GraphQL query and render a UI based on the results.

To configure the GraphQL server.

To define a mutation in a React application.

To implement client-side routing.

Question 7/15

What is the role of resolvers in a GraphQL server?

Select your answer

To manage HTTP requests and response headers.

To translate SQL queries into GraphQL queries.

To provide functions for each field in a type that connect to the data source.

To compile the GraphQL schema.

Question 8/15

What does JSX stand for in a React application?

Select your answer

JavaScript X-ray

JavaScript XHR

JavaScript XML

Java Serialized Execution

Question 9/15

Which of the following is a benefit of using Apollo Client in a React application?

Select your answer

State management, caching, and easy GraphQL interaction.

Automatic CSS animation rendering.

Native mobile development support.

HTML DOM manipulation.

Question 10/15

Which React hook is commonly used for executing side effects?

Select your answer

useState

useContext

useReducer

useEffect

Question 11/15

What is the main benefit of using GraphQL over REST APIs?

Select your answer

Support for multiple languages out of the box.

Built-in caching for queries.

Ability to retrieve as much or as little data as needed with a single query.

Automatic authentication and authorization.

Question 12/15

Which of the following is a major limitation of Apollo Client?

Select your answer

Handling subscriptions in real-time data updates.

Running queries in browsers older than IE9.

Managing large-scale state without external libraries.

Integrating with React context API.

Question 13/15

Which command can you use to create a new React application with Create React App?

Select your answer

node create-react-app my-app

npm start react my-app

npx create-react-app my-app

npm init react my-app

Question 14/15

Which concept does React use to pass data down to components as read-only?

Select your answer

State

Props

Hooks

Context

Question 15/15

Which of the following is a key feature of React that enhances performance?

Select your answer

Webpack

Virtual DOM

Stateful Components

Server-side rendering

Your Results

You did not answer any questions correctly.

Your Answers

Question 1/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the Apollo Link in the context of Apollo Client?

Available answers

To execute REST API calls outside GraphQL.

To create a request pipeline for outgoing operations.

To manage CSS within GraphQL queries.

To handle cookies across different domains.

Apollo Link is a sophisticated mechanism for constructing a pipeline to handle how outgoing GraphQL operations work, including the ability to create middleware for common behaviors.

Question 2/15

😊 Your answer was correct 🙁 Your answer was incorrect

In GraphQL, what is the purpose of fragments?

Available answers

To enable reusable units of query logic across operations.

To handle queries that exceed the character limit.

To perform authentication of query operations.

To split queries across multiple HTTP requests.

Fragments in GraphQL allow you to reuse query parts in multiple queries to avoid repeating code. They make it easy to ensure consistency and maintainability across similar queries.

Question 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the term 'optimistic UI update' refer to in the context of Apollo Client?

Available answers

It refers to updating UI only after receiving a successful query response.

It refers to waiting for error handling before updating the UI.

It refers to performing no change until server-side processing is complete.

It refers to updating the user interface immediately, anticipating a successful mutation response.

Optimistic UI update allows your app to immediately reflect a change assuming it will succeed. This improves user experience by reducing the latency perceived by delaying UI updates until server responses.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which HTTP method corresponds to the GraphQL query operation?

Available answers

DELETE

PUT

GET

POST

GraphQL queries typically use the HTTP GET method. However, they can also be sent over POST requests, especially when dealing with large queries or mutations.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

How does the useQuery hook in Apollo Client manage data fetching in a React application?

Available answers

It automatically fetches and updates data and provides loading and error states.

It only fetches data once and never updates.

It requires manual fetching of data when the component is mounted.

It handles only mutation operations, not queries.

The useQuery hook is designed to simplify data fetching in React components. It automatically handles the fetching process, caching, and provides developers with information about the loading and error states.

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the purpose of the <Query> component in Apollo Client?

Available answers

To execute a GraphQL query and render a UI based on the results.

To configure the GraphQL server.

To define a mutation in a React application.

To implement client-side routing.

The component in Apollo Client is responsible for allowing developers to execute GraphQL queries from within their React components and bind the results to the UI.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the role of resolvers in a GraphQL server?

Available answers

To manage HTTP requests and response headers.

To translate SQL queries into GraphQL queries.

To provide functions for each field in a type that connect to the data source.

To compile the GraphQL schema.

Resolvers are responsible for fetching the data for a single field in a type and are essential for fulfilling GraphQL queries.

Question 8/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does JSX stand for in a React application?

Available answers

JavaScript X-ray

JavaScript XHR

JavaScript XML

Java Serialized Execution

JSX stands for JavaScript XML. It is a syntax extension for JavaScript used in React to describe what the UI should look like.

Question 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a benefit of using Apollo Client in a React application?

Available answers

State management, caching, and easy GraphQL interaction.

Automatic CSS animation rendering.

Native mobile development support.

HTML DOM manipulation.

Apollo Client provides benefits such as efficient state management, caching, and simplifying GraphQL interaction in React applications.

Question 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which React hook is commonly used for executing side effects?

Available answers

useState

useContext

useReducer

useEffect

The

useEffect

hook in React is used for running side effects such as data fetching, subscription setting, or manual DOM manipulation.

Question 11/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the main benefit of using GraphQL over REST APIs?

Available answers

Support for multiple languages out of the box.

Built-in caching for queries.

Ability to retrieve as much or as little data as needed with a single query.

Automatic authentication and authorization.

GraphQL allows clients to specify exactly what data they need, reducing over-fetching or under-fetching of data commonly seen in REST APIs. This capability is encapsulated by the query language allowing for more efficient data retrieval.

Question 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a major limitation of Apollo Client?

Available answers

Handling subscriptions in real-time data updates.

Running queries in browsers older than IE9.

Managing large-scale state without external libraries.

Integrating with React context API.

Apollo Client can struggle with managing large-scale application state without mixing in other state management solutions like Redux.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which command can you use to create a new React application with Create React App?

Available answers

node create-react-app my-app

npm start react my-app

npx create-react-app my-app

npm init react my-app

To create a new React application using Create React App, you use the command

npx create-react-app my-app

. This sets up a ready-to-use React project.

Question 14/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which concept does React use to pass data down to components as read-only?

Available answers

State

Props

Hooks

Context

Props are the mechanism used by React to pass read-only data from parent to child components.

Question 15/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following is a key feature of React that enhances performance?

Available answers

Webpack

Virtual DOM

Stateful Components

Server-side rendering

React uses a virtual DOM to optimize rendering by computing the differences between the current and previous HTML and updating only the parts that have changed.