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React and GraphQL Quiz

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Question 1/15

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.

Native mobile development support.

Automatic CSS animation rendering.

HTML DOM manipulation.

Question 2/15

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 performing no change until server-side processing is complete.

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

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

Question 3/15

Which of the following best describes the purpose of the 'id' field in GraphQL type definitions?

Select your answer

It restricts access to type fields for security.

It indicates the primary key in the database only.

It defines relationships between different types in the schema.

It uniquely identifies each object of a given type and is used for caching.

Question 4/15

In React, what is the purpose of using keys in a list?

Select your answer

To encrypt component data.

To provide unique IDs for database records.

To help React identify which items have changed, are added, or removed.

To authenticate users in a list component.

Question 5/15

What is the role of resolvers in a GraphQL server?

Select your answer

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

To compile the GraphQL schema.

To manage HTTP requests and response headers.

To translate SQL queries into GraphQL queries.

Question 6/15

What does the cache in Apollo Client help prevent?

Select your answer

Excessive component rendering

GraphQL schema errors

GraphQL query misconfigurations

Redundant network requests

Question 7/15

Which HTTP method corresponds to the GraphQL query operation?

Select your answer

POST

GET

PUT

DELETE

Question 8/15

Which React hook is commonly used for executing side effects?

Select your answer

useState

useContext

useReducer

useEffect

Question 9/15

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

Select your answer

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

Automatic authentication and authorization.

Built-in caching for queries.

Support for multiple languages out of the box.

Question 10/15

In a typical GraphQL backend, how are queries verified for correctness before execution?

Select your answer

By static analysis based on the schema definition.

By running a test execution in parallel.

By checking against prior execution logs.

By examining the JSON response caching.

Question 11/15

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

Select your answer

To handle cookies across different domains.

To create a request pipeline for outgoing operations.

To manage CSS within GraphQL queries.

To execute REST API calls outside GraphQL.

Question 12/15

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

Select your answer

Webpack

Stateful Components

Server-side rendering

Virtual DOM

Question 13/15

What is the purpose of the component in Apollo Client?

Select your answer

To configure the GraphQL server.

To define a mutation in a React application.

To implement client-side routing.

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

Question 14/15

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

Select your answer

Context

Props

Hooks

State

Question 15/15

What key principle does GraphQL rely on, enabling type checking and validation at compile time?

Select your answer

Strongly-typed schema definition

Weak-typed query structures

Asynchronous I/O streams

Prototypal inheritance

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 a benefit of using Apollo Client in a React application?

Available answers

State management, caching, and easy GraphQL interaction.

Native mobile development support.

Automatic CSS animation rendering.

HTML DOM manipulation.

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

Question 2/15

😊 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 performing no change until server-side processing is complete.

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

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

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 3/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which of the following best describes the purpose of the 'id' field in GraphQL type definitions?

Available answers

It restricts access to type fields for security.

It indicates the primary key in the database only.

It defines relationships between different types in the schema.

It uniquely identifies each object of a given type and is used for caching.

The 'id' field in GraphQL type definitions serves as a unique identifier for objects, assisting with the optimization of client-side caching mechanisms.

Question 4/15

😊 Your answer was correct 🙁 Your answer was incorrect

In React, what is the purpose of using keys in a list?

Available answers

To encrypt component data.

To provide unique IDs for database records.

To help React identify which items have changed, are added, or removed.

To authenticate users in a list component.

Keys help React identify which items have changed, added, or removed, and are crucial for efficient updating of lists of elements.

Question 5/15

😊 Your answer was correct 🙁 Your answer was incorrect

What is the role of resolvers in a GraphQL server?

Available answers

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

To compile the GraphQL schema.

To manage HTTP requests and response headers.

To translate SQL queries into GraphQL queries.

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

Question 6/15

😊 Your answer was correct 🙁 Your answer was incorrect

What does the cache in Apollo Client help prevent?

Available answers

Excessive component rendering

GraphQL schema errors

GraphQL query misconfigurations

Redundant network requests

Apollo Client's cache helps to prevent redundant network requests by storing query results and serving them from the cache when the same query is executed again.

Question 7/15

😊 Your answer was correct 🙁 Your answer was incorrect

Which HTTP method corresponds to the GraphQL query operation?

Available answers

POST

GET

PUT

DELETE

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 8/15

😊 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 9/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

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

Automatic authentication and authorization.

Built-in caching for queries.

Support for multiple languages out of the box.

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 10/15

😊 Your answer was correct 🙁 Your answer was incorrect

In a typical GraphQL backend, how are queries verified for correctness before execution?

Available answers

By static analysis based on the schema definition.

By running a test execution in parallel.

By checking against prior execution logs.

By examining the JSON response caching.

GraphQL queries are statically analyzed for correctness against the schema before execution, which ensures that only valid queries are run.

Question 11/15

😊 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 handle cookies across different domains.

To create a request pipeline for outgoing operations.

To manage CSS within GraphQL queries.

To execute REST API calls outside GraphQL.

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 12/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

Webpack

Stateful Components

Server-side rendering

Virtual DOM

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.

Question 13/15

😊 Your answer was correct 🙁 Your answer was incorrect

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

Available answers

To configure the GraphQL server.

To define a mutation in a React application.

To implement client-side routing.

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

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 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

Context

Props

Hooks

State

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

What key principle does GraphQL rely on, enabling type checking and validation at compile time?

Available answers

Strongly-typed schema definition

Weak-typed query structures

Asynchronous I/O streams

Prototypal inheritance

GraphQL relies on a strongly-typed schema definition, enabling thorough query validation and type checking during development.