React and React Native Overview Quiz 3

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Questions and Answers

What percentage of the end user response time is spent on the front-end?

70-80%

90-100%

60-70%

80-90% (correct)

What does an 'empty cache' mean in the context of web pages?

Refreshing the page to clear the cache

Ensuring that the page is not cached

Bypassing the disk cache and requesting all the components to load the page (correct)

Storing most components in the disk cache to avoid HTTP requests

What does a 'full cache' allow in terms of components and HTTP requests?

Storing most components in the disk cache to avoid HTTP requests

Refreshing the page to clear the cache

Avoiding HTTP requests as most components are found in the disk cache (correct)

Bypassing the disk cache and requesting all the components to load the page

What is the purpose of the 'Expires' and 'Last-Modified' headers in the context of web caching?

Expires ensures the page is not cached, Last-Modified ensures the server will have to check if blank Signup and view all the answers

What does the 80/20 performance rule suggest about optimization?

Focus on the 20% that affects 80% of the user experience Signup and view all the answers

What is the main advantage of optimizing the front-end for performance improvement?

Simplicity in optimization Signup and view all the answers

What action does 'empty cache' require in the browser?

Clearing the cache to bypass disk storage Signup and view all the answers

How does a 'full cache' affect HTTP requests?

Decreases HTTP requests by avoiding disk cache Signup and view all the answers

What is the significance of the 'Expires' header in web caching?

Specifies an earlier date than today for page caching Signup and view all the answers

What does the 'Last-Modified' header ensure in web caching?

Forces the server to check if a page is blank Signup and view all the answers

Which method is the most effective way to optimize a website?

Gzip compression Signup and view all the answers

What does the Expires header control?

Caching behavior Signup and view all the answers

What is the primary purpose of Content Distribution Networks (CDNs)?

Improving download speed and efficiency Signup and view all the answers

What is the main benefit of using external JavaScript and CSS files?

Caching and reducing repetitive downloads Signup and view all the answers

According to Yahoo's best practices, what HTTP method should be used for AJAX requests?

GET Signup and view all the answers

What is the primary purpose of ReactJS?

Building user interfaces in single page applications Signup and view all the answers

Which major companies use ReactJS for building user interfaces?

Netflix, Facebook, and Airbnb Signup and view all the answers

What problem was React developed to address?

Complexity and performance issues of existing heavy-weight frameworks Signup and view all the answers

What type of library is React?

View layer library Signup and view all the answers

What is crucial for optimizing performance according to the text?

Minifying JavaScript and avoiding redirects Signup and view all the answers

What is the main difference between React and Angular in terms of data binding?

React uses 1-way data binding, while Angular supports 2-way data binding Signup and view all the answers

What is the purpose of JSX in React?

To allow easy mixing of HTML and JS Signup and view all the answers

What are the building blocks of React applications?

Components Signup and view all the answers

What is the difference between functional/stateless and class/stateful components in React?

The latter maintains its own state and lifecycle Signup and view all the answers

How is state accessed and updated in React components?

Accessed via this.state and updated using setState() Signup and view all the answers

What is React Native mainly used for?

Building native, cross-platform mobile apps using JavaScript and React Signup and view all the answers

How does React Native differ from React?

React is for building dynamic web interfaces, while React Native is for native mobile apps Signup and view all the answers

What type of data flow does React follow?

Unidirectional data flow Signup and view all the answers

What is a key difference between React and Angular in terms of flexibility?

React offers more flexibility in choosing additional libraries or tools Signup and view all the answers

What is a key difference between React and Angular in terms of development language?

React is built on JavaScript, while Angular is built on TypeScript Signup and view all the answers

Study Notes

React and React Native Overview

React uses 1-way data binding, unlike Angular, and employs a Virtual DOM for efficient updates.
JSX allows easy mixing of HTML and JS, and React has a strong developer community and useful dev tools.
Components are the building blocks of React applications, allowing for the UI to be split into reusable pieces.
React has functional/stateless and class/stateful components, with the latter maintaining its own state and lifecycle.
State in React is a JavaScript object containing component data, accessed via this.state and updated using setState().
React Native is a framework for building native, cross-platform mobile apps using JavaScript and React.
React Native implements a strict subset of CSS and is used by startups for its cost-effective development.
React and React Native differ in that React is for building dynamic web interfaces, while React Native is for native mobile apps.
React follows a unidirectional data flow and offers more flexibility in choosing additional libraries or tools.
Angular, on the other hand, is a full-fledged MVC framework developed by Google, built on TypeScript.
Angular supports two-way data binding, uses RxJS for asynchronous tasks, and has a steeper learning curve compared to React.
Both React and Angular are popular for building SPAs, focus on high performance, but differ in flexibility and tooling.

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Description

Test your knowledge of React and React Native with this overview quiz. Explore the differences between React and Angular, understand components and state management in React, and grasp the key concepts of React Native for cross-platform mobile app development.