What is the purpose of an Error Boundary in React?

To catch JavaScript errors in a component tree

Why are Environment Variables used in a React application?

To store sensitive information securely

In a React app, what does a CORS error indicate?

Issues with cross-origin requests

In a React application, how can you wrap a component with an Error Boundary?

Use the ErrorBoundary component as a parent of the component

What does an Error Boundary do when it catches an error in a React component tree?

Displays a fallback UI instead of crashing the app

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WDF - Error Handling

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React Unit - 5

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Questions 10

Answers

1
Which lifecycle method do you use to define an Error Boundary in a class component?
componentWillUnmount
componentDidCatch
componentShouldUpdate
componentDidMount
2
What is the purpose of an Error Boundary in React?
To manage state in functional components
To render components in a circular manner
To style error messages
To catch JavaScript errors in a component tree
3
What happens if an Error Boundary itself throws an error in React?
The Error Boundary displays a generic error message
The error is ignored and not caught
The Error Boundary catches the error and continues rendering
The entire app crashes
4
What does CORS stand for in web development?
Cross-Origin Resource System
Cross-Origin Resource Sharing
Cross-Origin Request System
Cross-Origin Retrieval System
5
Why are Environment Variables used in a React application?
To display pop-up messages
To create animations
To store sensitive information securely
To change the font size of components
6
In a React app, what does a CORS error indicate?
State management errors
Issues with cross-origin requests
Issues with styling components
Successful API request
7
Which HTTP header is used to specify which origins are allowed to access a resource in CORS?
Origin-Access-Allow
Access-Resource-Allow-Origin
Allow-Access-Control-Origin
Access-Control-Allow-Origin
8
Which file would you typically use to define environment-specific variables in a React app?
.js
.html
.css
.env
9
In a React application, how can you wrap a component with an Error Boundary?
Use the <ErrorHandler> component
Use the try...catch statement in the component's render method
Use the ErrorBoundary component as a parent of the component
Use the withErrorBoundary higher-order component
10
What does an Error Boundary do when it catches an error in a React component tree?
Ignores the error and continues rendering the app
Logs the error to the console only
Displays a fallback UI instead of crashing the app
Stops the entire app from rendering

WDF - Error Handling Flashcards | StudBud