React Fundamentals Quiz

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Questions and Answers

What is the primary purpose of React?

To manage databases within web applications
To enable developers to create user interfaces using pure JavaScript (correct)
To design applications using a new template language
To create server-side applications

Which of the following is a method used to create React elements?

React.createNode
React.createHTML
React.createComponent
React.createElement (correct)

What does JSX stand for in React?

JavaScript XML (correct)
JavaScript XHTML
Java Scripting eXtension
JavaScript Extension

What is a React component primarily used for?

To create user interfaces using React elements and JSX (D) Signup and view all the answers

How do you serve a simple React application using the provided instructions?

Run the command 'serve./hello.html' (C) Signup and view all the answers

Which of the following statements about React components is true?

They can be either JavaScript classes or functions. (D) Signup and view all the answers

What does the API ReactDOM.render do in the context of a React application?

Renders a React element to the DOM (B) Signup and view all the answers

Which of the following best describes the validity of using JSX in React?

JSX is an extension of JavaScript that allows for HTML-like syntax. (C) Signup and view all the answers

What does React support for HTTP programming?

Browser's built-in fetch() API and third-party libraries like axios (A) Signup and view all the answers

Which framework is commonly used for creating server-side applications in this context?

Express (C) Signup and view all the answers

What command is used to initialize a new Node application?

npm init (A) Signup and view all the answers

Which of the following modules is NOT required to create the Expense REST API server?

http (B) Signup and view all the answers

What is the purpose of the 'nedb' module in the Expense REST API?

To store expense data (B) Signup and view all the answers

When prompted for the project name during initialization, what name should be entered?

apiserver (D) Signup and view all the answers

What command should be used to install the required modules after initializing the project?

npm install (A) Signup and view all the answers

Which of these options describes a prerequisite for understanding HTTP programming in the context given?

Basic knowledge of HTTP protocol and REST API (B) Signup and view all the answers

What is the purpose of the Pager component in the expense entry application?

To manage pagination logic for rendering item lists (C) Signup and view all the answers

Which command is used to install the Material UI core package?

npm install @material-ui/core (A) Signup and view all the answers

What font does Material UI recommend for user interface elements?

Roboto (D) Signup and view all the answers

What is the function of the npm command 'npm start' in the setup process?

To serve the application and start a local development server (D) Signup and view all the answers

Which package should be installed to use SVG icons in Material UI?

@material-ui/icons (A) Signup and view all the answers

What should be done to include the Roboto font in a Material UI application?

Add a link to the font in the HTML file using Google APIs (B) Signup and view all the answers

In the provided items array, which item has the highest amount?

Mobile (C) Signup and view all the answers

Which of the following categories is NOT used in the items array?

Transportation (C) Signup and view all the answers

What is the role of a compiler in the process of creating a custom React application?

Compiles JavaScript variants into standard JavaScript supported by browsers. (B) Signup and view all the answers

Which command is used to initialize a new npm project in a custom React application?

npm init -y (A) Signup and view all the answers

What is the purpose of using Rollup in a React application?

To bundle multiple sources into a single deployable code. (B) Signup and view all the answers

Which package is used as the default package manager when creating a custom React application?

npm (A) Signup and view all the answers

What is the purpose of installing Babel and its preset libraries as development dependencies?

To ensure compatibility with different JavaScript versions. (A) Signup and view all the answers

What additional dependencies are installed for async programming in a custom React application?

corejs and regenerator-runtime (B) Signup and view all the answers

Which command do you use to install React libraries in a custom React application?

npm install react@^17.0.0 react-dom@^17.0.0 --save (D) Signup and view all the answers

Which bundler is mentioned as an alternative to Webpack for a customized React application?

Parcel (A) Signup and view all the answers

What is the primary purpose of using the 'cors' package in the application?

To facilitate cross-origin resource sharing (D) Signup and view all the answers

What HTTP method is used to create a new expense entry in the application?

POST (C) Signup and view all the answers

What will happen if the 'item' in the request body is not specified when trying to create or update an expense?

An error message will be added to the errors array but processing continues. (C) Signup and view all the answers

What data is returned when a DELETE request is made to '/api/expense/:id'?

A confirmation message indicating deletion (D) Signup and view all the answers

What is the purpose of 'body-parser' in this application?

To convert request body data into usable JSON (C) Signup and view all the answers

How does the application respond to a GET request to '/api/expenses'?

It sends back an array of all expenses. (D) Signup and view all the answers

What does the app.listen() function do in the application?

Enables the server to accept incoming requests on a specified port (B) Signup and view all the answers

What happens when the application receives a request for an undefined route?

The status code is set to 404. (A) Signup and view all the answers

What should you change the URL to in order to view initial expense entries?

<a href="http://localhost:8000/api/expense">http://localhost:8000/api/expense</a> (A) Signup and view all the answers

In the CSS provided for the ExpenseEntryItemList, what property is used to collapse borders in the table?

border-collapse (D) Signup and view all the answers

Which method is suggested to format and set items in the state of the component?

setItems (C) Signup and view all the answers

Which React component lifecycle method is generally used for initializing component state?

constructor (B) Signup and view all the answers

What structure contains the initial state of the ExpenseEntryItemList component?

this.state = { items: [] } (C) Signup and view all the answers

Which directory should the ExpenseEntryItemList.js file be created in?

src/components (A) Signup and view all the answers

In a React class component, which function should be called to access the component's props?

super(this.props) (C) Signup and view all the answers

What is one of the required styles for table header cells specified in the CSS?

border: 1px solid rgb(190,190,190); (C) Signup and view all the answers

Flashcards

React Component

A JavaScript function or class that represents a reusable UI component. It uses React elements and JSX to define its structure and behavior.

JSX

A JavaScript extension for creating user interfaces in React. It uses HTML-like syntax but compiles down to React elements.

React Element

A lightweight representation of an HTML DOM element, created using the React.createElement function. It is a plain JavaScript object describing the element's properties and children.

ReactDOM

React uses a library (or framework) called ReactDOM to render React elements onto the actual webpage. It can be compared to a bridge between React's virtual DOM and the real DOM.