What is JSX (JavaScript XML)?

A syntax extension for writing HTML-like code in JS files.

What does useState do?

It holds the fetched data so it can be rendered.

What is a JavaScript framework?

A predefined structure and set of tools for web app development.

What are some of the purposes of the useEffect hook?

Fetching data or subscribing to external services.

What triggers a re-render?

State or prop changes, or a parent re-rendering.

What is a functional component in React?

A JavaScript function that returns JSX.

They are passed like HTML attributes as parameters in a component.

What is a dependency injection?

Lets you provide parts of your app (e.g. services, APIs) at runtime.

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2025 DJS React Intro

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Questions 10

Answers

1
In JSX, we use the keyword "class" just like you would in HTML and CSS.
True
False
2
All component names must start with an uppercase letter so React knows it’s a component and not a native HTML tag.
True
False
3
What is JSX (JavaScript XML)?
A templating language for generating static HTML files.
A convention for separating HTML into modules.
A parser for converting JSON data to JavaScript objects.
A syntax extension for writing HTML-like code in JS files.
4
What does useState do?
Declares default prop types for the component.
It holds the fetched data so it can be rendered.
Sets up routing rules between different pages.
Subscribes to external event streams reactively.
5
What is a JavaScript framework?
A collection of utility functions for DOM manipulation.
A way to define reusable HTML templates without JavaScript.
A set of guidelines for organizing HTML modules.
A predefined structure and set of tools for web app development.
6
What are some of the purposes of the useEffect hook?
Defining initial state values for components.
Fetching data or subscribing to external services.
Passing props to child components.
Handling user input events within form elements.
7
What triggers a re-render?
Updating static content in the render function.
State or prop changes, or a parent re-rendering.
Importing new modules during development.
Adding inline event handlers in JSX.
8
What is a functional component in React?
A JavaScript function that returns JSX.
A utility for applying scoped DOM to components.
A hook that manages side effects in components.
A module that handles application routing logic.
9
What are props?
Values stored in a shared global context.
They are passed like HTML attributes as parameters in a component.
Methods for directly modifying component state via the DOM.
Configuration options for defining lifecycle methods specifically in React.
10
What is a dependency injection?
Lets you provide parts of your app (e.g. services, APIs) at runtime.
A pattern for managing event listeners across the app.
A strategy for reducing bundle sizes at build time.
A method for passing data between unrelated components.

2025 DJS React Intro Flashcards | StudBud